Keep host tools running when clear does not know the terminal

clear exits 1 for a TERM the host has no terminfo entry for, such as
xterm-ghostty or xterm-kitty over SSH, and when TERM is unset under cron.
The tools that run under errexit died on it in header_info within a
second, before showing anything, which telemetry counts as
"exit_code=1 | General error" with no step for update-lxcs, update-repo,
fstrim, clean-lxcs, execute and storage-share-helper.

Fall back to the escape sequence the engine's _cs_clear uses.

tools/pve/clean-lxcs.sh

@@ -5,7 +5,7 @@
 # https://github.com/community-scripts/ProxmoxVE/raw/main/LICENSE
 
 function header_info() {
-  clear
+  clear 2>/dev/null || printf '\033[H\033[2J\033[3J'
   cat <<"EOF"
    ________                    __   _  ________
   / ____/ /__  ____ _____     / /  | |/ / ____/

tools/pve/cron-update-lxcs.sh

@@ -19,7 +19,7 @@ CONF_FILE="/etc/update-lxcs.conf"
 LOG_FILE="/var/log/update-lxcs-cron.log"
 CRON_ENTRY="0 0 * * 0 ${LOCAL_SCRIPT} >>${LOG_FILE} 2>&1"
 
-clear
+clear 2>/dev/null || printf '\033[H\033[2J\033[3J'
 cat <<"EOF"
    ______                    __  __          __      __          __   _  ________
   / ____/________  ____     / / / /___  ____/ /___ _/ /____     / /  | |/ / ____/____

tools/pve/execute.sh

@@ -6,7 +6,7 @@
 # https://github.com/community-scripts/ProxmoxVE/raw/main/LICENSE
 
 function header_info() {
-  clear
+  clear 2>/dev/null || printf '\033[H\033[2J\033[3J'
   cat <<"EOF"
      ______                     __          __   _  ________
    / ____/  _____  _______  __/ /____     / /  | |/ / ____/

tools/pve/fstrim.sh

@@ -3,7 +3,7 @@
 set -eEuo pipefail
 
 function header_info() {
-  clear
+  clear 2>/dev/null || printf '\033[H\033[2J\033[3J'
   cat <<"EOF"
     _______ __                     __                    ______     _
    / ____(_) /__  _______  _______/ /____  ____ ___     /_  __/____(_)___ ___

tools/pve/guest-delete.sh

@@ -5,7 +5,7 @@
 # License: MIT | https://github.com/community-scripts/ProxmoxVE/raw/main/LICENSE
 
 function header_info {
-  clear
+  clear 2>/dev/null || printf '\033[H\033[2J\033[3J'
   cat <<"EOF"
     ____                                          ______                __     ____       __     __
    / __ \_________  _  ______ ___  ____  _  __   / ____/_  _____  _____/ /_   / __ \___  / /__  / /____

tools/pve/hw-acceleration.sh

@@ -9,7 +9,7 @@
 
 set -e
 function header_info {
-  clear
+  clear 2>/dev/null || printf '\033[H\033[2J\033[3J'
   cat <<"EOF"
 
    __ ___      __  ___              __             __  _

tools/pve/pbs3-upgrade.sh

@@ -6,7 +6,7 @@
 # https://github.com/community-scripts/ProxmoxVE/raw/main/LICENSE
 
 header_info() {
-  clear
+  clear 2>/dev/null || printf '\033[H\033[2J\033[3J'
   cat <<"EOF"
     ____  ____ __________    __  ______  __________  ___    ____  ______
    / __ \/ __ ) ___/__  /   / / / / __ \/ ____/ __ \/   |  / __ \/ ____/
@@ -168,7 +168,7 @@ while true; do
   case $yn in
   [Yy]*) break ;;
   [Nn]*)
-    clear
+    clear 2>/dev/null || printf '\033[H\033[2J\033[3J'
     exit
     ;;
   *) echo "Please answer yes or no." ;;

tools/pve/pbs4-upgrade.sh

@@ -5,7 +5,7 @@
 # License: MIT | https://github.com/community-scripts/ProxmoxVE/raw/main/LICENSE
 
 header_info() {
-  clear
+  clear 2>/dev/null || printf '\033[H\033[2J\033[3J'
   cat <<"EOF"
     ____  ____ _____ __ __     __  __                           __   
    / __ \/ __ ) ___// // /    / / / /___  ____ __________ _____/ /__ 
@@ -192,7 +192,7 @@ while true; do
   case $yn in
   [Yy]*) break ;;
   [Nn]*)
-    clear
+    clear 2>/dev/null || printf '\033[H\033[2J\033[3J'
     exit
     ;;
   *) echo "Please answer yes or no." ;;

tools/pve/post-pbs-install.sh

@@ -5,7 +5,7 @@
 # License: MIT | https://github.com/community-scripts/ProxmoxVE/raw/main/LICENSE
 
 header_info() {
-  clear
+  clear 2>/dev/null || printf '\033[H\033[2J\033[3J'
   cat <<"EOF"
     ____  ____ _____    ____             __     ____           __        ____
    / __ \/ __ ) ___/   / __ \____  _____/ /_   /  _/___  _____/ /_____ _/ / /
@@ -89,7 +89,7 @@ main() {
     case $yn in
     [Yy]*) break ;;
     [Nn]*)
-      clear
+      clear 2>/dev/null || printf '\033[H\033[2J\033[3J'
       exit
       ;;
     *) echo "Please answer yes or no." ;;

tools/pve/post-pdm-install.sh

@@ -5,7 +5,7 @@
 # License: MIT | https://github.com/community-scripts/ProxmoxVE/raw/main/LICENSE
 
 header_info() {
-  clear
+  clear 2>/dev/null || printf '\033[H\033[2J\033[3J'
   cat <<"EOF"
     ____  ____  __  ___   ____             __     ____           __        ____
    / __ \/ __ \/  |/  /  / __ \____  _____/ /_   /  _/___  _____/ /_____ _/ / /
@@ -412,7 +412,7 @@ while true; do
   case $yn in
   [Yy]*) break ;;
   [Nn]*)
-    clear
+    clear 2>/dev/null || printf '\033[H\033[2J\033[3J'
     exit
     ;;
   *) echo "Please answer yes or no." ;;

tools/pve/post-pmg-install.sh

@@ -5,7 +5,7 @@
 # License: MIT | https://github.com/community-scripts/ProxmoxVE/raw/main/LICENSE
 
 header_info() {
-  clear
+  clear 2>/dev/null || printf '\033[H\033[2J\033[3J'
   cat <<"EOF"
     ____  __  _________   ____             __     ____           __        ____
    / __ \/  |/  / ____/  / __ \____  _____/ /_   /  _/___  _____/ /_____ _/ / /
@@ -410,7 +410,7 @@ while true; do
   case $yn in
   [Yy]*) break ;;
   [Nn]*)
-    clear
+    clear 2>/dev/null || printf '\033[H\033[2J\033[3J'
     exit
     ;;
   *) echo "Please answer yes or no." ;;

tools/pve/post-pve-install.sh

@@ -6,7 +6,7 @@
 # https://github.com/community-scripts/ProxmoxVE/raw/main/LICENSE
 
 header_info() {
-  clear
+  clear 2>/dev/null || printf '\033[H\033[2J\033[3J'
   cat <<"EOF"
     ____ _    ________   ____             __     ____           __        ____
    / __ \ |  / / ____/  / __ \____  _____/ /_   /  _/___  _____/ /_____ _/ / /
@@ -81,7 +81,7 @@ main() {
     case $yn in
     [Yy]*) break ;;
     [Nn]*)
-      clear
+      clear 2>/dev/null || printf '\033[H\033[2J\033[3J'
       exit
       ;;
     *) echo "Please answer yes or no." ;;

tools/pve/pve8-upgrade.sh

@@ -6,7 +6,7 @@
 # https://github.com/community-scripts/ProxmoxVE/raw/main/LICENSE
 
 header_info() {
-  clear
+  clear 2>/dev/null || printf '\033[H\033[2J\033[3J'
   cat <<"EOF"
     ____ _    ____________     __  ______  __________  ___    ____  ______
    / __ \ |  / / ____( __ )   / / / / __ \/ ____/ __ \/   |  / __ \/ ____/
@@ -118,7 +118,7 @@ while true; do
   case $yn in
   [Yy]*) break ;;
   [Nn]*)
-    clear
+    clear 2>/dev/null || printf '\033[H\033[2J\033[3J'
     exit
     ;;
   *) echo "Please answer yes or no." ;;

tools/pve/scaling-governor.sh

@@ -11,7 +11,7 @@ source <(curl -fsSL "${COMMUNITY_SCRIPTS_CORE_URL:-https://raw.githubusercontent
 declare -f init_tool_telemetry &>/dev/null && init_tool_telemetry "scaling-governor" "pve"
 
 header_info() {
-  clear
+  clear 2>/dev/null || printf '\033[H\033[2J\033[3J'
   cat <<EOF
   ________  __  __  _____
  / ___/ _ \/ / / / / ___/__ _  _____ _______  ___  _______
@@ -26,7 +26,7 @@ GOV_BASE="/sys/devices/system/cpu/cpu0/cpufreq"
 if [[ ! -r "$GOV_BASE/scaling_governor" || ! -r "$GOV_BASE/scaling_available_governors" ]]; then
   whiptail --backtitle "Proxmox VE Helper Scripts" --title "CPU Scaling Not Available" \
     --msgbox "CPU frequency scaling is not available on this system.\n\nThis is normal when no cpufreq driver is active (e.g. CPU power management handled by the BIOS, or certain virtualized hosts)." 12 70
-  clear
+  clear 2>/dev/null || printf '\033[H\033[2J\033[3J'
   exit 0
 fi
 
@@ -42,7 +42,7 @@ done < <(tr ' ' '\n' <"$GOV_BASE/scaling_available_governors" | sed '/^$/d' | gr
 scaling_governor=$(whiptail --backtitle "Proxmox VE Helper Scripts" --title "Current CPU Scaling Governor is set to $current_governor" --radiolist "\nSelect the Scaling Governor to use:\n" 16 $((MSG_MAX_LENGTH + 58)) 6 "${GOVERNORS_MENU[@]}" 3>&1 1>&2 2>&3 | tr -d '"')
 [ -z "$scaling_governor" ] && {
   whiptail --backtitle "Proxmox VE Helper Scripts" --title "No CPU Scaling Governor Selected" --msgbox "It appears that no CPU Scaling Governor was selected" 10 68
-  clear
+  clear 2>/dev/null || printf '\033[H\033[2J\033[3J'
   exit
 }
 echo "${scaling_governor}" | tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor >/dev/null

tools/pve/storage-share-helper.sh

@@ -11,7 +11,7 @@ declare -f init_tool_telemetry &>/dev/null && init_tool_telemetry "storage-share
 set -eEuo pipefail
 
 function header_info() {
-  clear
+  clear 2>/dev/null || printf '\033[H\033[2J\033[3J'
   cat <<"EOF"
     _____ __                                 ___    _________ 
    / ___// /_____  _________ _____ ____     /   |  /  _/ __ \

tools/pve/update-lxcs.sh

@@ -6,7 +6,7 @@
 # https://github.com/community-scripts/ProxmoxVE/raw/main/LICENSE
 
 function header_info() {
-  clear
+  clear 2>/dev/null || printf '\033[H\033[2J\033[3J'
   cat <<"EOF"
    __  __          __      __          __   _  ________
   / / / /___  ____/ /___ _/ /____     / /  | |/ / ____/

tools/pve/update-repo.sh

@@ -6,7 +6,7 @@
 # https://github.com/community-scripts/ProxmoxVE/raw/main/LICENSE
 
 function header_info {
-  clear
+  clear 2>/dev/null || printf '\033[H\033[2J\033[3J'
   cat <<"EOF"
    __  __          __      __          ____                 
   / / / /___  ____/ /___ _/ /____     / __ \___  ____  ____