fix(worker): replace time.Sleep with channel sync in consumer manager test

[arzonus]

What changed?

• Added unexported afterIterFn func() field and withAfterIterFn option to ConsumerManager (service/worker/asyncworkflow/async_workflow_consumer_manager.go). The run() loop calls the hook after each ticker iteration (nil-guarded; zero overhead in production).
• Updated TestConsumerManagerEnabledDisabled to use the hook instead of time.Sleep(50ms). Added mockTimeSrc.BlockUntil(1) before the first Advance to ensure the ticker is registered before advancing time.

Why?
time.Sleep(50ms) is not a reliable synchronization primitive — under CI load the background goroutine may not finish processing the tick in time. The hook signals completion precisely. BlockUntil(1) prevents the race where Advance fires before the run() goroutine has called NewTicker, which would leave the advance with no timer to fire and cause the test to deadlock.

Detected as a flaky test: TestConsumerManagerEnabledDisabled fired 3× in CI (Jan–Apr 2026).

How did you test it?

go test -race -count=5 -timeout 30s \
  -run TestConsumerManagerEnabledDisabled \
  ./service/worker/asyncworkflow/...

All pass.

Potential risks
Low. afterIterFn is unexported, nil-guarded (zero overhead in production), called only within the ticker.Chan() select arm. The production ConsumerManager always has afterIterFn == nil.

Release notes
N/A

Documentation Changes
N/A

[gitar-bot]

Code Review ✅ Approved

Replaced time.Sleep with channel synchronization in the consumer manager test to improve reliability and execution speed. No issues found.

Rules ✅ All requirements met

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