Fix: Embedded Model Type Should Not Accept Any Audit

[bearInTheRoad]

This is to fix #5546. After the fix, EMBEDDED model will reject any audit in model definition.

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[izeigerman]

@bearInTheRoad can you please remove the test from here https://github.com/TobikoData/sqlmesh/blob/main/examples/sushi_dbt/models/schema.yml#L45-L46 so that the migration_test passes

[bearInTheRoad]

@bearInTheRoad can you please remove the test from here https://github.com/TobikoData/sqlmesh/blob/main/examples/sushi_dbt/models/schema.yml#L45-L46 so that the migration_test passes

Hey @izeigerman, I've removed this test in my branch but seems like migration_test fails because it's using code from the old tag.

Should I update dbt/basemodel.py and skip ephemeral models for backward compatible purpose? Or do you prefer we stay this way and merge?