fix: stop running OPTIMIZE for auto liquid clustering

[sd-db]

Resolves #1655

Description

Stops auto_liquid_cluster from triggering synchronous OPTIMIZE after table, incremental, and snapshot materializations. dbt continues to configure automatic liquid clustering with CLUSTER BY AUTO, but no longer runs a synchronous OPTIMIZE after materialization.

Explicit zorder and liquid_clustered_by configurations retain their existing optimization behavior.

Checklist

• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests
• I have updated the CHANGELOG.md and added information about my change to the "dbt-databricks next" section
• [Optional] I have run the dbt-databricks-pr-ready project skill for this PR and addressed its merge-readiness feedback

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