Resolve "Filter by `None`/`Any` for labels in issues/mrs API"

What does this MR do?

By using the parameters ?labels=None|Any the user can filter issues/mrs from the API that has none/any label.

Affected endpoints are:

• /api/issues
• /api/projects/:id/issues
• /api/groups/:id/issues
• /api/merge_requests
• /api/projects/:id/merge_requests
• /api/groups/:id/merge_requests

What are the relevant issue numbers?

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.

Closes #52371 (closed)