Reintroduce a way to tag the latest commit in auto-deploy regardless of pipeline status

During the migration of auto-deploy branches to the Security repository, we seem to have lost the ability to force a tagging of the current HEAD of the auto-deploy branch regardless of its pipeline status.

We currently always tag the latest_successful_on_build.

In emergency situations it makes sense to force a tagging on the latest commit regardless of status.

Solution:

• AUTO_DEPLOY_TAG_LATEST -- When set to any value, always tags the latest commit in the current auto-deploy branch regardless of its pipeline status.