Enable housekeeping for project and group wiki repos [RUN ALL RSPEC] [RUN AS-IF-FOSS]

What does this MR do?

Enable the feature flag wiki_housekeeping, enabling housekeeping for all project and group wiki repositories.

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Separation of EE specific content

Related to #299343 (closed)