Issue Board API support

What does this MR do?

Adds support for Issue Board in the API.

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

Double check whether the Issue Board list movement fix is needed.

Moved to a separate issue. #22890

Why was this MR needed?

Currently the API offers partial support to a project's Issue Board indirectly through Labels. This MR adds support for listing, creating, moving and removing board lists.

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 merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if you do - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

#22195