[coverage] Conformance findings: ERRORRECOV-013

[peco-engineer-bot]

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

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.

• ERRORRECOV-013: driver does not retry transient transport-level errors on ExecuteStatement (nonRetryableClientMethods); a force-closed connection surfaces the transport error verbatim (request error after 1 attempt) instead of retrying and recovering

Reference driver PR: adbc-drivers/databricks#373
Coverage PR (reproducing xfail tests): https://github.com/databricks/databricks-driver-test/pull/895