Fix: Exempt seed models from migration

[izeigerman]

No description provided.

[Copilot]

Pull Request Overview

This PR fixes an issue where seed models were incorrectly included in schema migration logic for production deployments. The change exempts seed models from migration by adding an additional condition to check if the model is a seed type.

• Added logic to exclude seed models from production schema migration support
• Added comprehensive integration test to verify seed model promotion behavior

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
sqlmesh/core/snapshot/definition.py	Added condition to exempt seed models from schema migration support
tests/core/test_integration.py	Added integration test for seed model promotion from dev to prod

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