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.

先从上游报告和 Durable Entities v2 的 Python entity 请求开始，然后将其与 host 的 rollbackEntityOperationsOnExceptions 设置以及 gRPC 或 extension/protobuf 契约进行比较。执行列出的 mutation、batching、failure 和 retry 用例，随后针对受支持的 v2 provider 进行端到端的 host 覆盖测试。完成的标准是验证语义，或识别并链接所需的 extension/protobuf 工作，而不是添加仅 SDK 的行为。