fix: removing Thread.sleep() from KubernetesReconcilerCreatorTest

[sarveshkaushal]

Notes

Replaces the fixed Thread.sleep() in KubernetesReconcilerCreatorTest with semaphore based synchronization.

The custom work-queue key function releases a semaphore after adding the generated request to the controller work queue. The test waits for that signal before asserting on the queue.

This is related to issue #1223

Testing

Ran mvn install on the project root.

[kubernetes-prow]

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[sarveshkaushal]

/assign @brendandburns