fix: Document Databricks SQL Warehouse tuning parameters and client_timeout

[claudespice]

Summary

• The Databricks catalog connector has 5 SQL Warehouse connection tuning parameters (max_concurrent_requests, http_max_retries, backoff_method, statement_max_retries, disable_on_permanent_error) and a client_timeout parameter that were implemented in code but not documented.
• The SQL Warehouse tuning parameters only exist in trunk (vNext), so they are added only to the unversioned docs.
• The client_timeout parameter exists in both trunk and v1.11.5, so it is added to both vNext and v1.11.x versioned docs.

Changes

• Added "SQL Warehouse connection tuning" table to vNext Databricks catalog docs with all 5 tuning parameters and their defaults
• Added client_timeout parameter documentation to both vNext and v1.11.x Databricks catalog docs

Reference

Verified against spiceai/spiceai at trunk — crates/runtime/src/catalogconnector/databricks.rs lines 80-104
Verified client_timeout exists at v1.11.5 — same file, line 78

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