Thomas Trompette 95a34d8517 Return false instead of throwing when event stream does not exist (#20165)
## Summary

- When an event stream expires (TTL), `addQueryToEventStream` and
`removeQueryFromEventStream` now return `false` instead of throwing
`EVENT_STREAM_DOES_NOT_EXIST` as an `InternalServerError`
- Frontend checks the mutation return value and triggers the
destroy/recreate cycle, same recovery behavior without the error path
- Removes `EVENT_STREAM_DOES_NOT_EXIST` from exception code, exception
filter, and frontend graceful error check since it's no longer thrown

## Test plan

- [x] Verify that when an event stream TTL expires, the frontend
silently recreates the stream without error noise in logs/Sentry
- [x] Verify that `NOT_AUTHORIZED` errors still throw correctly on both
mutations
- [ ] Verify that the subscription `onEventSubscription` still works
end-to-end with stream creation, query registration, and heartbeat TTL
refresh

Made with [Cursor](https://cursor.com)
2026-05-04 15:06:18 +00:00
2025-08-07 17:02:12 +02:00

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