Provide guidance on the recommended way to use UDFs defined outside dbt

While issue dbt-labs/dbt-core#13154 is closed and UDFs are removed from "When should I turn static analysis off" section of the official doc (https://github.com/dbt-labs/docs.getdbt.com/pull/8568), we cannot compile models that use UDFs defined outside dbt without setting `static_analysis='off'`.

What is the preferred way to use such UDFs in dbt fusion? Migrating all our existing UDFs to dbt is not practical, and setting `static_analysis='off'` is not a satisfactory workaround because we would lose the benefits of the fusion engine.