Api project hook wiki page events

What does this MR do?

Updates project hook API for wiki page events. Also updates docs and tests for forgotten hook fields.

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

No.

Why was this MR needed?

API consistency.

What are the relevant issue numbers?

#17652 (closed)

Screenshots (if relevant)

N/A

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