[Dataflow Streaming] Improve logs

[arunpandianp]

No description provided.

[arunpandianp]

R: @scwhittle

[gemini-code-assist]

Summary of Changes

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This pull request focuses on refining the diagnostic output of the Dataflow Streaming worker by standardizing the terminology used in its logging and exception messages. By consistently referring to 'sharding key' instead of a more ambiguous 'key', the changes aim to provide clearer and more precise information, which is crucial for debugging and understanding the operational state of work items within the streaming pipeline.

Highlights

• Standardized Logging: Replaced generic 'key' references with 'sharding key' in various log messages across the Dataflow Streaming worker for improved clarity and consistency.
• Enhanced Exception Messages: Updated the KeyCommitTooLargeException message to explicitly mention 'sharding key', providing more precise context for commit failures.
• Improved Failure Processing Logs: Modified debug and error logs within the WorkFailureProcessor to consistently use 'sharding key' when reporting work item failures, aiding in quicker diagnosis.

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