Better rewrite rule flushing in `test_permalink_without_title()`.

This ensures that the test is not polluted by permalink structure changes in
earlier tests.
Built from https://develop.svn.wordpress.org/trunk@30529


git-svn-id: http://core.svn.wordpress.org/trunk@30518 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove failing `test_network_limit()` XML-RPC test.

Test added as a patch on #21292.

Props MikeHansenMe.
See #30284.
Built from https://develop.svn.wordpress.org/trunk@30530


git-svn-id: http://core.svn.wordpress.org/trunk@30519 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Color Schemes: fix the pointer UP arrow color, fixes #30460.
Built from https://develop.svn.wordpress.org/trunk@30531


git-svn-id: http://core.svn.wordpress.org/trunk@30520 1a063a9b-81f0-0310-95a4-ce76da25c4cd