Ignore data track promise rejections after a subscription readable stream is discarded

[1egoman]

When track.subscribe({ signal }) is called and the signal is aborted, IncomingDataTrackManager.openSubscriptionStream rejects two things with the same DataTrackSubscribeError:

1. The ReadableStream (catchable via try/catch)
2. An internal sfuSubscriptionComplete promise, used primarily in the tests, but also used during the brief window before the sfu subscription is established to communicate errors back to the user.

Because RemoteDataTrack.subscribe() returns only the stream and discards the promise, no handler was ever attached to the sfuSubscriptionComplete promise, which meant that any rejections become unhandledRejections.

This pull request works around this by adding a no-op .catch(() => {}) to this promise to silence any errors.

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size-limit report 📦

Path	Size
dist/livekit-client.esm.mjs	96.87 KB (-0.02% 🔽)
dist/livekit-client.umd.js	105.79 KB (+0.06% 🔺)