Support Databricks query tags in session properties

[WhammyLeaf]

Description

The Databricks SQL connector supports per-statement query_tags, but SQLMesh did not previously pass model/session-level session_properties.query_tags through to the connector. This change stores validated query tags for the active adapter session and forwards them to Databricks SQL connector executions.

Query tags are only applied on the Databricks SQL connector path. They are not passed when execution is routed through Spark session / Databricks Connect paths, since those cursors do not support the query_tags argument.

ISSUE: #5795

Test Plan

• Added Databricks engine adapter tests covering:
  • forwarding session query tags to Databricks SQL connector executions
  • clearing query tags after the session ends
  • preserving explicit per-statement query_tags
  • accepting NULL query tag values
  • rejecting invalid session_properties.query_tags
  • not applying query tags to Spark session / Databricks Connect execution paths
• Verified the installed Databricks SQL connector exposes Cursor.execute(..., query_tags=...).
• Built the package wheel successfully.
• Ran:

pytest -q -o addopts='' tests/core/engine_adapter/test_databricks.py
python -m pip wheel . --no-deps -w /tmp/sqlmesh-wheel-final

[WhammyLeaf]

Will fix the failing style tests.

[WhammyLeaf]

@izeigerman Perhaps you can have a look at this 😄 ?

[StuffbyYuki]

@WhammyLeaf Can you rebase your branch? Then I'll kick off the workflows and give it a review!

[WhammyLeaf]

@WhammyLeaf Can you rebase your branch? Then I'll kick off the workflows and give it a review!

Should be done now 😄

[StuffbyYuki]

@WhammyLeaf Just gave it a review, and these are not blockers but curious your thoughts:

• Load-time validation for query_tags in meta.py (consistent with query_label / authorization)
• Model-level tests in test_model.py
• Brief docs in databricks.md for MAP(...) syntax and SQL-connector-only limitation

Let me know if I'm missing anything!

[WhammyLeaf]

@WhammyLeaf Just gave it a review, and these are not blockers but curious your thoughts:

• Load-time validation for query_tags in meta.py (consistent with query_label / authorization)
• Model-level tests in test_model.py
• Brief docs in databricks.md for MAP(...) syntax and SQL-connector-only limitation

Let me know if I'm missing anything!

@StuffbyYuki This sounds about right. I have added both load-time validation, model-level tests and documentation now 😄

[StuffbyYuki]

@WhammyLeaf Thanks for the changes! The last thing is the DCO checks, and once all CI tests pass I'll merge