test: Increase timeout in testListenForChildChangedWithLimitEnsureEventsFireProperly

[paulb777]

Addresses CI database integration test timeout flakiness by increasing the event waiting timeout from 10 seconds to 30 seconds.

This test that failed in multiple runs of #16278 now passes.

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[danger-firebase-ios]

	1 Warning
⚠️	Did you forget to add a changelog entry? (Add #no-changelog to the PR description to silence this warning.)

Generated by 🚫 Danger

[paulb777]

/gemini review

[gemini-code-assist]

Code Review

This pull request replaces the use of the WAIT_FOR macro with explicit waitUntil:timeout: block-based assertions in FIRDatabaseQueryTests.m to handle asynchronous waiting with a 30-second timeout. There are no review comments to address, and I have no feedback to provide.