Support Omnibus-only changes for auto-deploy tagging
Previously, when no component version changes were present, we aborted the auto-deploy tagging. This prevented us from bringing in changes that happened in Omnibus.
Now we check if the Omnibus auto-deploy branch has progressed beyond our tag, and consider that as a change and proceed with tagging.
Closes https://gitlab.com/gitlab-org/release/framework/issues/412
2840782a - Add a version_map accessor
We were passing this variable around to every method, which got messy.