Declare user_email when setting up fixtures for `count_user_posts()` tests.

Because `setUpBeforeClass()` is called statically and creates its own factory
object, the iterator logic from previous tests is not carried over to these
fixtures, and we risk the possibility of user_email clashes when the tests are
run in certain limited configurations.
Built from https://develop.svn.wordpress.org/trunk@30512


git-svn-id: http://core.svn.wordpress.org/trunk@30501 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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