Create a new Backbone view, `media.view.Label`, which can be used as a subview in things like toolbars, which need screen reader text.

Make an initial instance of it for the label for Bulk Actions in Media Grid.

See #29026.

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git-svn-id: http://core.svn.wordpress.org/trunk@29212 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid: add screen reader text in a subview on the toolbar, a `media.view.Label` instance before `media.view.DateFilter`.

See #29026.

Built from https://develop.svn.wordpress.org/trunk@29435


git-svn-id: http://core.svn.wordpress.org/trunk@29213 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Revert styling changes to the Attachment Details modal from [29289]. fixes #28844.

Built from https://develop.svn.wordpress.org/trunk@29436


git-svn-id: http://core.svn.wordpress.org/trunk@29214 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid: use a `media.view.Label` instance in the toolbar for the screen reader text for Search.

See #29026.

Built from https://develop.svn.wordpress.org/trunk@29437


git-svn-id: http://core.svn.wordpress.org/trunk@29215 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid: 

* Use a `media.view.Label` instance in the toolbar for the screen reader text for the "all" dropdown.
* Adjust the spinner's priority.

Fixes #29026.

Built from https://develop.svn.wordpress.org/trunk@29438


git-svn-id: http://core.svn.wordpress.org/trunk@29216 1a063a9b-81f0-0310-95a4-ce76da25c4cd