[Dataflow Streaming] Remove dead code around redundant experiments

[arunpandianp]

The experiments are not needed, they are also not set on the outgoing requests.

[arunpandianp]

R: @scwhittle

[gemini-code-assist]

Summary of Changes

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This pull request focuses on improving code maintainability by eliminating obsolete experiment-related logic within the Dataflow runner. The removed code segments were responsible for conditionally adding specific streaming engine experiments, which have been deemed unnecessary and were not actively influencing the behavior of outgoing requests. This cleanup streamlines the codebase without altering the functional aspects of the Dataflow pipeline execution.

Highlights

• Code Cleanup: Removed redundant code that conditionally added 'enable_streaming_engine' and 'enable_windmill_service' experiments. These experiments were identified as unnecessary and were not being set on outgoing requests.

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Changelog

• runners/google-cloud-dataflow-java/src/main/java/org/apache/beam/runners/dataflow/DataflowRunner.java
  • Removed logic for adding 'enable_streaming_engine' and 'enable_windmill_service' experiments.

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