[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-nodejs.

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: Thrift does not retry a transport-level failure (TCP connection close) on ExecuteStatement — surfaces the error after a single attempt (ExecuteStatement excluded from retryableThriftMethods)
• ERRORRECOV-013: SEA kernel does not retry a raw connection-close on ExecuteStatement — fails after 1 attempt with 'HTTP request failed after 1 attempts' despite tagging the error retryable:true

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