noahlemen c7d703ebb8 Remove useMutableSource (#27011)
## Summary

This PR cleans up `useMutableSource`. This has been blocked by a
remaining dependency internally at Meta, but that has now been deleted.

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## How did you test this change?

```
yarn flow
yarn lint
yarn test --prod
```

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DiffTrain build for [80d9a40114](https://github.com/facebook/react/commit/80d9a40114bb43c07d021e8254790852f450bd2b)
2023-06-27 16:50:41 +00:00
2023-06-27 16:50:41 +00:00
2020-01-09 14:07:41 -08:00
S
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