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This prevents PlaybackManager's seek while enabling an audio track from causing the AudioMixingSink to push audio blocks forward unnecessarily. Previously, the seek would cause the initial block or blocks to repeat from the perspective of AudioMixingSink, so it would think that it needs to shift the first block after the seek forward by a few samples. By moving this to the AudioDataProvider, we can clear the last sample index every time the decoder is flushed, ensuring that the block shifting always makes sense. By doing this in AudioMixingSink instead of the Decoder implementations, we avoid having to duplicate this shifting logic across multiple implementations. This also fixes an issue where multiple audio blocks occupying the same timestamp would be skipped while seeking, causing a significant break in audio.