Removed `ExoPlayer.experimentalSetOffloadSchedulingEnabled` as scheduling will be enabled by default when offload is enabled for audio-only playback.
In addition, the `experimental` key word was taken out of the following
method signatures:
* `ExoPlayer.experimentalIsSleepingForOffload`
* `AudioOffloadListener.onExperimentalSleepingForOffloadChanged`
* `AudioOffloadListener.onExperimentalOffloadedPlayback`
PiperOrigin-RevId: 565035289