Adjust the RegEx in `wp_check_filetype()` to be aware that query strings are thing that exist sometimes in URLs.

Adds unit tests.

Props voldemortensen.
Fixes #30377.

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git-svn-id: http://core.svn.wordpress.org/trunk@30630 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Editor: no pointer for DFW v2 when editor-scrolling is not used. Pass `$post_type` in the `wp_editor_expand` filter. See #30458.
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git-svn-id: http://core.svn.wordpress.org/trunk@30631 1a063a9b-81f0-0310-95a4-ce76da25c4cd