Media Grid, support `MEDIA_TRASH`:

* Add a setting to `_wpMediaViewsL10n.settings`: `mediaTrash`
* In the attachment edit modal, properly toggle between Trash/Untrash
* In `media.view.Attachment`, add a method for `untrashAttachment`
* When creating the grid toolbar, switch the setting order of subviews so that `media.view.DeleteSelectedButton` can listen to the instance of `media.view.AttachmentFilters.All` to update the text in its UI.
* Add a new filter to `media.view.AttachmentFilters.All`, `trash`, when `settings.mediaTrash` is true
* Allow the cached queries in `Query.get()` to be flushed when race conditions exist and collections need to be refreshed. This is currently only being used when `MEDIA_TRASH` is set, to refresh the filtered/mirrored collections related to `all`, `trash`, and any already queried filter.
* Cleanup the bootstrapping of `media.view.MediaFrame.Manage`
* Allow `wp_ajax_query_attachments()` to return items from the trash when `MEDIA_TRASH` is `true`
* Allow `wp_ajax_save_attachment()` to set `post_status` when `MEDIA_TRASH` is `true`. It allows `wp_delete_post()` to be called, which will trash the attachment instead of deleting when the flag is set.

Props koop for the knowledge sharing and thought partnership.
See #29145.

Built from https://develop.svn.wordpress.org/trunk@29490


git-svn-id: http://core.svn.wordpress.org/trunk@29268 1a063a9b-81f0-0310-95a4-ce76da25c4cd