fix: cwctl upgrade in ubuntu 24.04 (#10305)

- fix pip install during cwctl upgrade in `ubuntu 24.04`
- add logs during pnpm installation
- fix `pnpm` installation during upgrade

Ref
> PEP 668 specification in Ubuntu 24.04, which marks the Python
environment as "externally managed." This means it restricts using pip
for system-wide package installations to avoid conflicts with
system-managed packages.

deployment/setup_20.04.sh

@@ -804,9 +804,12 @@ function upgrade_node() {
 function get_pnpm() {
   # if pnpm is already installed, return
   if command -v pnpm &> /dev/null; then
+    echo "pnpm is already installed. Skipping installation."
     return
   fi
+  echo "pnpm is not installed. Installing pnpm..."
   npm install -g pnpm
+  echo "Cleaning up existing node_modules directory..."
   sudo -i -u chatwoot << "EOF"
   cd chatwoot
   rm -rf node_modules
@@ -847,7 +850,7 @@ function upgrade() {
 
   # Update dependencies
   bundle
-  pnpm -i
+  pnpm i
 
   # Recompile the assets
   rake assets:precompile RAILS_ENV=production NODE_OPTIONS="--max-old-space-size=4096 --openssl-legacy-provider"
@@ -992,7 +995,7 @@ function cwctl_upgrade_check() {
     # Check if packaging library is installed, and install it if not
     if ! python3 -c "import packaging.version" &> /dev/null; then
         echo "Installing packaging library..."
-        python3 -m pip install packaging
+        install_packaging
     fi
 
     needs_update=$(python3 -c "from packaging import version; v1 = version.parse('$CWCTL_VERSION'); v2 = version.parse('$remote_version'); print(1 if v2 > v1 else 0)")
@@ -1009,6 +1012,27 @@ function cwctl_upgrade_check() {
 
 }
 
+##############################################################################
+# Check for PEP 668 restrictions and install packaging accordingly
+# Globals:
+#   None
+# Arguments:
+#   None
+# Outputs:
+#   None
+##############################################################################
+function install_packaging() {
+  ubuntu_version=$(lsb_release -r | awk '{print $2}')
+  if [[ "$ubuntu_version" == "24.04" ]]; then
+    echo "Detected Ubuntu 24.04. Installing packaging library using apt."
+    apt install -y python3-packaging
+  else
+    echo "Installing packaging library using pip."
+    python3 -m pip install packaging
+  fi
+}
+
+
 
 ##############################################################################
 # upgrade cwctl