Check for conflict with wiki projects when creating a new project.

What does this MR do?

Check for conflict with wiki projects when creating a new project

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

No

Why was this MR needed?

To avoid exposing the information from the wiki repository of other project

What are the relevant issue numbers?

#18398

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• CHANGELOG entry added
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the style guides
• Branch has no merge conflicts with master (if you do - rebase it please)
• Squashed related commits together