Support parsing DatabricksQuery field

[rohantandon]

Background

Support for the DatabricksQuery key. Hold off on merging this until backend support hits from this PR

Changes

Testing

[cursor]

PR Summary

Low Risk
Low risk because this extends existing query-field handling and validation without changing runtime detection logic. The main risk is incorrect index/log type extraction for new Databricks-backed saved or scheduled queries.

Overview
Adds first-class DatabricksQuery support for saved and scheduled queries. Index generation now preserves the field and can extract log types from direct or scheduled Databricks SQL, while keeping Query and SnowflakeQuery precedence unchanged.

Updates VS Code JSON schemas so query configs can use Query, SnowflakeQuery, or DatabricksQuery. Adds focused tests for the index-generation behavior and wires them into CI via make test-generate-indexes.

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