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This change selects the best suited media button receiver component and pending intent when creating the legacy session. This is important to ensure that a service can be started with a media button event from BT headsets after the app has been terminated. The `MediaSessionLegacyStub` selects the best suited receiver to be passed to the `MediaSessionCompat` constructor. 1. When the app has declared a broadcast receiver for `ACTION_MEDIA_BUTTON` in the manifest, this broadcast receiver is used. 2. When the session is housed in a service, the service component is used as a fallback. 3. As a last resort a receiver is created at runtime. When the `MediaSessionLegacyStub` is released, the media button receiver is removed unless the app has provided a media button receiver in the manifest. In this case we assume the app supports resuming when the BT play intent arrives at `MediaSessionService.onStartCommand`. Issue: androidx/media#167 Issue: androidx/media#27 Issue: androidx/media#314 PiperOrigin-RevId: 523638051 (cherry picked from commit e54a9343980c7f6c44ddf0edbb938dd5f6b11193)