Customizer: Remove date filter from the Header/Background Image upload frames.

Adds an option to `wp.media.view.AttachmentsBrowser` to hide the date filter added in [29813].

see #30689.
Built from https://develop.svn.wordpress.org/trunk@30872


git-svn-id: http://core.svn.wordpress.org/trunk@30862 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Clarify the behaviour of the `wp_editor_set_quality` and `jpeg_quality` filters.

Props DH-Shredder
See #29856

Built from https://develop.svn.wordpress.org/trunk@30874


git-svn-id: http://core.svn.wordpress.org/trunk@30863 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Correct the height of the search type `select` element when searching the plugin directory.

See #30719
Props pavelevap, eliorivero

Built from https://develop.svn.wordpress.org/trunk@30879


git-svn-id: http://core.svn.wordpress.org/trunk@30867 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Autoprefixer for [30857].

see #30435.
Built from https://develop.svn.wordpress.org/trunk@30884


git-svn-id: http://core.svn.wordpress.org/trunk@30872 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Customizer: Add `_wp_attachment_is_custom_background` meta to uploaded background images.

Adds `$type` property to `WP_Customize_Background_Image_Control` (PHP) and introduces `wp.customize.BackgroundControl` (JS).

see #30707.
Built from https://develop.svn.wordpress.org/trunk@30885


git-svn-id: http://core.svn.wordpress.org/trunk@30873 1a063a9b-81f0-0310-95a4-ce76da25c4cd