KeyCommitTooLarge logging improvements

[rwiggles]

Support logging the key during a KeyCommitTooLarge if EnableHotKeyLogging is turned on. Also switch to logging the dfe name instead of the computation name and fix an overflow in logging the sharding key.

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[gemini-code-assist]

Summary of Changes

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This pull request enhances the logging capabilities for KeyCommitTooLargeException in the Dataflow worker. By allowing the inclusion of the specific key in error messages, it improves debuggability for large commit issues. The change introduces a configurable flag to toggle this behavior, ensuring it can be enabled selectively via worker options or experiment flags.

Highlights

• Hot Key Logging: Introduced an optional hot key logging feature that includes the key in the KeyCommitTooLargeException error message when enabled.
• Configuration: Added a new boolean flag 'hotKeyLoggingEnabled' to the StreamingWorkScheduler, configurable via worker options or an experiment flag.
• Testing: Expanded StreamingDataflowWorkerTest to verify that the key is correctly included or excluded from error messages based on the configuration.

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[gemini-code-assist]

Code Review

This pull request adds support for hot key logging in KeyCommitTooLargeException by passing a hotKeyLoggingEnabled flag and updates the streaming work scheduler and tests accordingly. However, the changes introduce several compilation issues due to importing standard instead of vendored dependencies (Guava, Protobuf, and gRPC) across multiple files, as well as importing DataflowRunner into the worker module, which causes a circular dependency. The feedback advises replacing these with their vendored counterparts and checking the experiments list directly from the options.

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