[expo-av] Fix stability issue due to player-item observers not cleaned up #9350
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Why
There are reports of crashes in the observer handling code of AVPlayerData, see #7764. This PR fixes a problem with AVPlayerItem observers not being removed after the AVQueuePlayer switched to another item.
Together with #9334, this might provide a fix for #7764 but that needs to be verified first.
How
Replay
option to NCL in order to verify existing replay behaviorTest Plan