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This is a step towards adding general support for overlapping subtitles in these formats (and others), both muxed and sideloaded: * Issue: google/ExoPlayer#10295 * Issue: google/ExoPlayer#4794 This change adds these files to the end-to-end playback tests too, but the subtitle track is currently disabled because renderer-side subtitle parsing causes flaky tests (due to an uncontrolled thread in `SimpleSubtitleDecoder`). The subtitle track will be re-enabled in a follow-up change when loading-side subtitle parsing is added (so the tests will no longer be flaky). At this point the overlapping subtitles **still** won't be supported end-to-end, but a second change will resolve this will changes in `TextRenderer` - which will change the end-to-end playback dumps to reflect the overlapping subtitles. PiperOrigin-RevId: 548705032