Cross-reference `WP_Comment_Query::query()` as the location for finding information on default arguments for `WP_Comment_Query`.

Also updates the return types on `get_comments()` and `get_approved_comments()`, as an integer can also be returned if the `$count` argument is true.

Fixes #30111.

Built from https://develop.svn.wordpress.org/trunk@30281


git-svn-id: http://core.svn.wordpress.org/trunk@30281 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove failing unit tests from 'canonical' group.

Each removed test has been turned into a patch and posted to the open ticket
that it belongs to.

See #30284.
Built from https://develop.svn.wordpress.org/trunk@30282


git-svn-id: http://core.svn.wordpress.org/trunk@30282 1a063a9b-81f0-0310-95a4-ce76da25c4cd