Gitlab upgrade to 14.6.0

upgrade gitlab

There is no upgrade path blocker. BigBang can safely upgrade from 14.3.1 to 14.4.1
https://docs.gitlab.com/ee/update/#1440

At the same time also include issue https://repo1.dso.mil/platform-one/big-bang/apps/developer-tools/gitlab/-/issues/46

should also upgrade gitlab-runner

Gitlab-runner should also be upgraded to at least the same major-minor version. There are runner images for 14.4.0.
There is a separate issue for gitlab-runner package. The gitlab and gitlab-runner upgrades should be tested together in a BigBang deployment.