SDK / exoplayer

In terms of MCVR with a `VideoRendererEventListener`, the video size is set to
0/0 right after `onVideoDisabled()` is called and is set to the actual size as
soon as the video size is known after 'onVideoEnabled()`.

For ExoPlayer and in terms of the `Player` interface, `Player.getVideoSize()`
returns a video size of 0/0 when `Player.getCurrentTracks()` does not support
`C.TRACK_TYPE_VIDEO`. This is ensured by the masking behavior of
`ExoPlayerImpl` that sets an empty track selection result when the playing
period changes due to a seek or timeline removal.

When transitioning playback from a video media item to the next, or when
seeking within the same video media item, the renderer is not disabled.

#minor-release

PiperOrigin-RevId: 533479600
(cherry picked from commit f38cbad98558145b3b89f1bb57b25f3105ea36f9)