fix(sql_connect): e2e listen test refactor

[aashishpatil-g]

The e2e listen test for subscription cancels is failing. This PR refactors that test case.

Summary of Improvements Made by Antigravity

Eliminated Unhandled Exception Risks: Added completion checks (!listenerXReady.isCompleted, !listenerXReceivedUpdate.isCompleted) so multiple stream emissions will never throw StateError: Bad state: Future already completed.

Synchronized Readiness for Both Listeners: Used Future.wait([listener1Ready.future, listener2Ready.future]) to guarantee both subscriptions process initial setup before performing mutations.

Removed Arbitrary Future.delayed Sleep: Replaced the 5-second sleep with a deterministic Completer (listener2ReceivedUpdate.future) to prevent test flakiness and speed up execution.

Added Timeout Protection: Wrapped all awaited futures with .timeout(_listenTimeout) to prevent test hanging if a stream fails to emit.

Added Refetch Trigger for 2nd Movie: Added await MoviesConnector.instance.listMovies().ref().execute(); after creating Raiders of the Lost Arc to guarantee the query update is triggered for active stream subscribers.

Guaranteed Stream Cleanup: Placed resource cancellations inside a try ... finally block so both subscriptions are properly disposed of even if an assertion fails.

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