Multimap streaming

[acrites]

Removes checks for set, map, and multimap state for both batch and streaming. All versions now support these persistent state types. Adds tests for non-runner v2 batch and streaming that all persistent state types are supported. verifyDoFnSupported is never called for runner v2 jobs.

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[gemini-code-assist]

Summary of Changes

Hello @acrites, 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 significantly enhances the Apache Beam Dataflow Runner by enabling full support for SetState, MapState, and MultimapState across both batch and streaming execution paradigms. This change removes previous limitations, allowing developers to leverage these persistent state types more broadly in their Dataflow pipelines, and includes new tests to validate this expanded functionality.

Highlights

• Expanded State Support: SetState, MapState, and MultimapState are now fully supported for both batch and streaming pipelines on the Dataflow Runner.
• Removed Restrictions: Previous UnsupportedOperationException checks within the DataflowRunner that restricted the use of these state types have been eliminated.
• New Verification Tests: Comprehensive tests have been added to confirm that all persistent state types (Value, Bag, Set, Map, Multimap, OrderedList) are correctly handled in both batch and streaming execution modes.

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