fix(dynamodb): harden transactional storage conflicts - #10372
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DynamoDB transactional state storage conflicts could leave a storage instance reusable without reloading and provided limited context for diagnosing failed transaction operations.
This change hardens conflict handling by requiring a successful
Loadafter failed stores and adding operation-indexed, partition-scoped diagnostics without exposing payloads. It also expands coverage for strict ETags, no-change and duplicate-sequence behavior, stale-writer convergence, idempotency, andTransactionConflictcharacterization so conflict behavior remains predictable while preserving public APIs.Microsoft Reviewers: Open in CodeFlow