Comments: In get_comment_statuses(), also return trash.

XML-RPC: In `wp_xmlrpc_server::wp_editComment()`, allow comments to be trashed.

Introduce unit tests for `wp_editComment` in `xmlrpc/*` #NeverForget

Props tyxla, wonderboymusic.
Fixes #30965.


git-svn-id: https://develop.svn.wordpress.org/trunk@34524 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/comment-functions.php

@@ -237,6 +237,8 @@ function get_comment_statuses() {
 		'approve'	=> _x('Approved', 'adjective'),
 		/* translators: comment status */
 		'spam'		=> _x('Spam', 'adjective'),
+		/* translators: comment status */
+		'trash'		=> _x('Trash', 'adjective'),
 	);
 
 	return $status;