Add repository housekeeping methods to wikis

What does this MR do?

In !51564 (merged) we extracted the project housekeeping methods to reuse them later in wikis.

In this MR we add those methods through a concern to project and group wikis.

Does this MR meet the acceptance criteria?

Conformity

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

Related to #296892 (closed)