Investigate rollbackEntityOperationsOnExceptions semantics for Durable Entities

Upstream report: https://github.com/Azure/azure-functions-durable-python/issues/274

Investigate whether azure-functions-durable v2 entities honor the host rollbackEntityOperationsOnExceptions setting. This may require a Durable Functions extension or wire-contract change if the setting is not available in the Python entity request.

Investigation goals

• Verify omitted/default and explicit true: set, delete, create, and in-place mutation followed by an exception are rolled back.
• Verify explicit false: those mutations remain applied.
• Verify that, in a multi-operation batch, only the failed operation is rolled back and successful operations before and after it remain applied.
• Verify callers observe the operation failure without an unintended retry.
• Add end-to-end host coverage for supported v2 providers.
• If the gRPC or extension contract cannot carry this option, identify and link the required extension/protobuf work rather than implementing SDK-only behavior.

先從上游報告和 Durable Entities v2 的 Python entity 請求開始，然後將其與 host 的 rollbackEntityOperationsOnExceptions 設定以及 gRPC 或 extension/protobuf 契約進行比較。執行列出的 mutation、batching、failure 和 retry 案例，接著針對受支援的 v2 provider 進行端到端的 host 覆蓋。完成的標準是驗證語義，或識別並連結所需的 extension/protobuf 工作，而不是新增僅限 SDK 的行為。