Changes cleanup thread to forceExecute. (#38073)

[acrites]

Runs cleanup thread in its own executor.

Otherwise, we can deadlock if all finalization threads are running. This can happen if e.g. a worker starts up and the pipeline has already been running. It then first gets a bunch of ids to execute and then gets gets a callback to register, which starts up the cleanup thread.

This PR also moves cleanups to a separate ScheduledExecutorService to simplify the cleanup logic as well as prevent it from blocking WorkItem processing.

This is part of a fix of changes in PR #37723.

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refactors the cleanup mechanism for bundle finalization in the StreamingDataflowWorker. By moving cleanup tasks to a dedicated ScheduledExecutorService, the changes prevent potential deadlocks that could occur when finalization threads are exhausted. This architectural shift simplifies the cleanup logic and ensures that cleanup tasks do not interfere with critical WorkItem processing.

Highlights

• Executor Separation: Moved cleanup tasks to a dedicated ScheduledExecutorService to prevent blocking WorkItem processing and avoid potential deadlocks.
• Cleanup Logic Refactoring: Replaced the manual cleanup thread and priority queue with scheduled tasks, simplifying the finalization logic.
• Testing Improvements: Added a new test case to verify bundle finalizers are correctly called and updated existing tests to reflect the new architecture.

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[stankiewicz]

org.apache.beam.vendor.grpc.v1p69p0.com.google.protobuf.TextFormat$ParseException: 1:276: Input contains unknown fields and/or extensions:
1:276:	windmill.GetWorkResponse.applied_finalize_ids
	at app//org.apache.beam.vendor.grpc.v1p69p0.com.google.protobuf.TextFormat$Parser.checkUnknownFields(TextFormat.java:1761)
	at app//org.apache.beam.vendor.grpc.v1p69p0.com.google.protobuf.TextFormat$Parser.merge(TextFormat.java:1780)
	at app//org.apache.beam.vendor.grpc.v1p69p0.com.google.protobuf.TextFormat$Parser.merge(TextFormat.java:1670)
	at app//org.apache.beam.vendor.grpc.v1p69p0.com.google.protobuf.TextFormat.merge(TextFormat.java:1450)
	at app//org.apache.beam.runners.dataflow.worker.StreamingDataflowWorkerTest.buildInput(StreamingDataflowWorkerTest.java:570)
	at app//org.apache.beam.runners.dataflow.worker.StreamingDataflowWorkerTest.makeInput(StreamingDataflowWorkerTest.java:673)
	at app//org.apache.beam.runners.dataflow.worker.StreamingDataflowWorkerTest.testBundleFinalizersAreCalled(StreamingDataflowWorkerTest.java:4344)