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The MP4 data in JPEG motion photos can contain multiple `video/hevc` tracks, but only the first is at a playable frame rate while the others are low-fps, high-res tracks designed for specific use-cases (not direct video playback). ExoPlayer currently selects the unplayable track by default, because it has a higher resolution. This change introduces a flag to `Mp4Extractor` that results in the first video track being marked as `ROLE_FLAG_MAIN`, and all subsequent video tracks `ROLE_FLAG_ALTERNATE` - this then results in the playable lower-res track being selected by default. PiperOrigin-RevId: 589832072