Remove failing test for unimplemented `wp_mail()` enhancement.

The removed test has been added as a patch to the original ticket, #15448.

Props MikeHansenMe.
See #30284.
Built from https://develop.svn.wordpress.org/trunk@30516


git-svn-id: http://core.svn.wordpress.org/trunk@30505 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove skipped tests for unimplemented JS plural functions.

The tests have been added as a patch for the original ticket, #22229.

Props MikeHansenMe.
See #22229.
Built from https://develop.svn.wordpress.org/trunk@30517


git-svn-id: http://core.svn.wordpress.org/trunk@30506 1a063a9b-81f0-0310-95a4-ce76da25c4cd