[macOS] Remove macOS 10.14 related code in the VE repo (#4816)

* [MacOS] Remove code for macOS-10.14

* remove is_Less_BigSur in all script

* remove variable the IsLessThanBigSur

images/macos/provision/configuration/configure-machine.sh

@@ -29,7 +29,7 @@ fi
 # sudo security delete-certificate -Z FF6797793A3CD798DC5B2ABEF56F73EDC9F83A64 /Library/Keychains/System.keychain
 curl https://www.apple.com/certificateauthority/AppleWWDRCAG3.cer --output $HOME/AppleWWDRCAG3.cer --silent
 # Big Sur requires user interaction to add a cert https://developer.apple.com/forums/thread/671582, we need to use a workaround with SecItemAdd swift method
-if is_Less_BigSur; then
+if is_Catalina; then
     sudo security add-trusted-cert -d -r unspecified -k /Library/Keychains/System.keychain $HOME/AppleWWDRCAG3.cer
 else
     swiftc $HOME/image-generation/add-certificate.swift

images/macos/provision/configuration/finalize-vm.sh

@@ -5,7 +5,7 @@ source ~/utils/utils.sh
 # Close all finder windows because they can interfere with UI tests
 osascript -e 'tell application "Finder" to close windows'
 
-if is_Less_BigSur; then
+if is_Catalina; then
     # Ignore available updates to prevent system pop-ups
     updateName=$(softwareupdate -l | grep "Title: " | awk -F[:,] '{print $2}' | awk '{$1=$1};1') || true
     if [ ! -z "$updateName" ]; then

images/macos/provision/configuration/preimagedata.sh

@@ -8,7 +8,7 @@ os_name=$(sw_vers -productName)
 os_version=$(sw_vers -productVersion)
 os_build=$(sw_vers -buildVersion)
 label_version=$(echo $os_version | cut -d. -f1,2)
-if is_Less_BigSur; then
+if is_Catalina; then
     label_version=$(echo $os_version | cut -d. -f1,2)
 else
     label_version=$(echo $os_version | cut -d. -f1)