Remove failing tests related to `WP_User::__unset()`.

These tests have been added as a patch to their original ticket, #20043.

Props MikeHansenMe.
See #30284.
Built from https://develop.svn.wordpress.org/trunk@30513


git-svn-id: http://core.svn.wordpress.org/trunk@30502 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove failing tests related to square brackets being stripped in URL sanitizers.

These tests have been added as a patch to their original ticket, #16859.

Props MikeHansenMe.
See #30284.
Built from https://develop.svn.wordpress.org/trunk@30514


git-svn-id: http://core.svn.wordpress.org/trunk@30503 1a063a9b-81f0-0310-95a4-ce76da25c4cd