Comments controller: fix issue where comments are allowed when closed

[ellatrix]

What?

The comments endpoint allows no type to be specified, in which case comment should be assumed.

https://github.com/WordPress/wordpress-develop/blob/a27e6a8ecd5279a45e47ef88d048643740d07b5a/src/wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php#L591

Why?

Comments can be submitted even if comments are closed.

How?

Testing Instructions

Testing Instructions for Keyboard

Screenshots or screencast

[github-actions]

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Co-authored-by: Mamaduka <[email protected]>

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[xavier-lc]

Tested locally via curl and it returns the proper response:

{"body":{"code":"rest_comment_closed","message":"Sorry, comments are closed for this item.","data":{"status":403}},"status":403,"headers":{"Allow":"GET"}}

[github-actions]

Flaky tests detected in 904a28e.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/11822624735
📝 Reported issues:

• [Flaky Test] submenu click on the arrow interactions #61884 in /test/e2e/specs/editor/blocks/navigation-frontend-interactivity.spec.js

[priethor]

I just cherry-picked this PR to the release/19.6 branch to get it included in the next release: af38d43

[priethor]

I just cherry-picked this PR to the release/19.7 branch to get it included in the next release: 14c270e