Resolve "Gitlab version update for resource quality of service"

Package Owner Merge Request

Package Changes

Add default configuration for resource requests and limits.
Make requests and limits equal.
Add some documentation.

Package MR

https://repo1.dso.mil/platform-one/big-bang/apps/developer-tools/gitlab/-/merge_requests/74

Package Release

https://repo1.dso.mil/platform-one/big-bang/apps/developer-tools/gitlab/-/releases/4.12.9-bb.2

Closes #723 (closed)