[coverage] Conformance findings: DIRECTRES-001,DIRECTRES-002,DIRECTRES-003,DIRECTRES-004,DIRECTRES-011

从 coverage PR 中的 Expected-Failure 测试开始，将它们针对 DIRECTRES-001 到 DIRECTRES-011 的 assertions 与 reference driver PR 进行比较。跟踪原生 SEA ExecuteStatement 请求，以及 CLOSED 结果和多 chunk 响应的处理。启用 direct results 后，如果 xfail 测试无需正值 wait_timeout 即可通过，并且包括冗余关闭和截断用例，就算完成。

Surfaced by the multi-language coverage fan-out while conformance-testing these SPEC-IDs against databricks/databricks-sql-python.

Each is committed as an expected-failure (xfail) test in the coverage PR — the test asserts the CORRECT behavior and stays red until this driver is fixed.

• DIRECTRES-001: native SEA backend sends a positive wait_timeout on ExecuteStatement; ES-2034600 fix omits it when direct results are on
• DIRECTRES-002: native SEA backend sends a positive wait_timeout on ExecuteStatement; ES-2034600 fix omits it when direct results are on
• DIRECTRES-003: native SEA backend sends a positive wait_timeout on ExecuteStatement; ES-2034600 fix omits it when direct results are on
• DIRECTRES-004: native SEA backend sends a positive wait_timeout; the CLOSED-as-success skip-redundant-close contract cannot be conformed (ES-2034600)
• DIRECTRES-011: SEA ExecuteStatement sends positive wait_timeout instead of omitting it; multi-chunk result can be silently truncated to chunk 0 under sync-hybrid (ES-2034600)

Reference driver PR: https://github.com/adbc-drivers/databricks/pull/566
Coverage PR (reproducing xfail tests): https://github.com/databricks/databricks-driver-test/pull/786