Unify Ruby images in CI

What does this MR do?

Replace hard coded value for Ruby Docker Image in CI configuration files.

Related issues

Closes #5492 (closed)

Checklist

See Definition of done.

For anything in this list which will not be completed, please provide a reason in the MR discussion

Required

• Merge Request Title, and Description are up to date, accurate, and descriptive
• MR targeting the appropriate branch
• MR has a green pipeline on GitLab.com
• Pipeline is green on dev.gitlab.org if the change is touching anything besides documentation or internal cookbooks
• trigger-package has a green pipeline running against latest commit

Expected (please provide an explanation if not completing)

The change modifies only .review-docs job which can be only triggered with Maintainer permissions as described here.

This job has one Ruby dependency: the Gitlab gem which is compliant with Ruby 2.7, the current version used in CI.

• Test plan indicating conditions for success has been posted and passes
• Documentation created/updated
• Tests added
• Integration tests added to GitLab QA
• Equivalent MR/issue for the GitLab Chart opened