test: smoke-test proxy IT dispatch workflow

Trivial docstring addition touching `src/` to exercise the
.github/workflows/trigger-integration-tests.yml dispatch path
end-to-end:

  - On PR open: skip-integration-tests-pr should post a synthetic
    `success` Python Proxy Tests check.
  - Add `integration-test` label: trigger-tests-pr should
    dispatch to databricks/databricks-driver-test.
  - Push a new commit: remove-label-on-new-commit should clear
    the label and post the security-reset comment.

Not for merge — close after smoke test confirms the workflow
behaves end-to-end.

Co-authored-by: Isaac
Signed-off-by: Vikrant Puppala <vikrant.puppala@databricks.com>

Author: vikrantpuppala

src/databricks/sql/backend/kernel/__init__.py

@@ -22,4 +22,9 @@
 
 See ``docs/designs/pysql-kernel-integration.md`` in
 ``databricks-sql-kernel`` for the full integration design.
+
+Cross-repo integration tests for this backend run via the proxy-based
+harness in ``databricks/databricks-driver-test`` (suite name
+``Python Proxy Tests``). They're previewable on a PR with the
+``integration-test`` label and gate the merge queue.
 """