Remove all macOS-10.15 related code (#7078)

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

@@ -36,9 +36,9 @@ defaults write com.apple.VoiceOver4/default SCREnableAppleScript -bool YES
 # Confirm that the correct intermediate certificate is installed by verifying the expiration date is set to 2030.
 # sudo security delete-certificate -Z FF6797793A3CD798DC5B2ABEF56F73EDC9F83A64 /Library/Keychains/System.keychain
 # 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_Catalina; then
-    swiftc "${HOME}/image-generation/add-certificate.swift"
-fi
+
+swiftc "${HOME}/image-generation/add-certificate.swift"
+
 
 certs=(
     AppleWWDRCAG3.cer
@@ -49,11 +49,7 @@ for cert in ${certs[@]}; do
     cert_path="${HOME}/${cert}"
     curl "https://www.apple.com/certificateauthority/${cert}" --output ${cert_path} --silent
 
-    if is_Catalina; then
-        sudo security add-trusted-cert -d -r unspecified -k /Library/Keychains/System.keychain ${cert_path}
-    else
-        sudo ./add-certificate ${cert_path}
-    fi
+    sudo ./add-certificate ${cert_path}
 
     rm ${cert_path}
 done

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

@@ -5,14 +5,6 @@ source ~/utils/utils.sh
 # Close all finder windows because they can interfere with UI tests
 close_finder_window
 
-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
-        sudo softwareupdate --ignore "$updateName"
-    fi
-fi
-
 # Remove Parallels Desktop
 # https://github.com/actions/runner-images/issues/6105
 if is_Monterey; then

images/macos/provision/configuration/preimagedata.sh

@@ -8,11 +8,8 @@ os_name=$(sw_vers -productName)
 os_version=$(sw_vers -productVersion)
 os_build=$(sw_vers -buildVersion)
 label_version=$(echo $os_version | cut -d. -f1,2)
-if is_Catalina; then
-    label_version=$(echo $os_version | cut -d. -f1,2)
-else
-    label_version=$(echo $os_version | cut -d. -f1)
-fi
+label_version=$(echo $os_version | cut -d. -f1)
+
 image_label="macos-${label_version}"
 release_label="macOS-${label_version}"
 software_url="https://github.com/actions/runner-images/blob/${release_label}/${image_version}/images/macos/${image_label}-Readme.md"