WIP: Resolve "from web browser wiki git link returns 404 rather than redirecting"

What does this MR do?

Redirects project .wiki suffix to wikis/home

Ex: /gitlab/gitlabhq.wiki -> /gitlab/gitlabhq/wikis/home

Also

Ex: /gitlab/gitlabhq.wiki.git -> /gitlab/gitlabhq/wikis/home

Are there points in the code the reviewer needs to double check?

At the moment the project#edit route spec is failing even though its working in browser, no idea why but will trace it further later.

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Review
  • Has been reviewed by UX
  • Has been reviewed by Frontend
  • Has been reviewed by Backend
  • Has been reviewed by Database
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together
• Internationalization required/considered
• End-to-end tests pass (package-and-qa manual pipeline job)

What are the relevant issue numbers?

Closes #19186 (closed)