Retain media controls longer

When the flag is enabled, apps which have not added support for
resumption via MediaBrowserService will still be set to a resume state when
the underlying notification (for apps using notification-based actions) or
session (for apps using PlaybackState actions) have gone away, if this
occurs after they've already timed out. These resume controls will not
have a play button, but just open the app's launcher intent when tapped.

If the control hadn't timed out yet, it will be removed from the carousel as
before. For apps which do implement long-term resumption, they will
continue to convert into resume state regardless of whether the active
player had already timed out.

Test: atest com.android.systemui.media.controls
Bug: 264691138
Change-Id: I13a43bfc2eca342000726e696afe77706947d774