Fix flaky MetricsTest by using polling assertions #2756
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Replace fixed Thread.sleep(600ms) + immediate assertions with assertEventually() polling pattern. The previous approach was susceptible to flakiness in CI environments where 600ms wasn't always sufficient for metrics to be reported. The fix uses the existing assertEventually utility which polls every 100ms with a 5-second timeout, matching the pattern already used in io.temporal.client.functional.MetricsTest.
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Summary
Thread.sleep(600ms)+ immediate assertions withassertEventually()polling patternassertEventuallyutility which polls every 100ms with a 5-second timeoutio.temporal.client.functional.MetricsTestTest plan