Chore: fix style CI failures

- Simplify known_models type annotation (UniqueKeyDict extends Dict, union was redundant)
- Reformat test list comprehension and assert to satisfy ruff line-length check

Author: Gabe Pesco

sqlmesh/core/schema_loader.py

@@ -41,9 +41,7 @@ def create_external_models_file(
             classified as external if it is absent from this full set. This prevents cross-repo
             internal models from being misclassified as external in multi-repo setups.
     """
-    known_models: t.Union[UniqueKeyDict[str, Model], t.Dict[str, Model]] = (
-        all_models if all_models is not None else models
-    )
+    known_models: t.Dict[str, Model] = all_models if all_models is not None else models
     external_model_fqns = set()
 
     for fqn, model in models.items():

tests/core/integration/test_multi_repo.py

@@ -587,7 +587,9 @@ def test_multi_repo_create_external_models(copy_to_temp_path):
 
     warning_messages = [str(call) for call in mock_warning.call_args_list]
     schema_lookup_warnings = [
-        msg for msg in warning_messages if "bronze" in msg and "a" in msg and "schema" in msg.lower()
+        msg
+        for msg in warning_messages
+        if "bronze" in msg and "a" in msg and "schema" in msg.lower()
     ]
     assert not schema_lookup_warnings, (
         "bronze.a should not be looked up as an external model, but got warnings: "
@@ -607,9 +609,7 @@ def test_multi_repo_create_external_models(copy_to_temp_path):
     repo_1_external = Path(repo_1_path) / c.EXTERNAL_MODELS_YAML
     if repo_1_external.exists():
         contents = yaml.load(repo_1_external)
-        assert len(contents) == 0, (
-            f"repo_1 should have no external models, got: {contents}"
-        )
+        assert len(contents) == 0, f"repo_1 should have no external models, got: {contents}"
 
     # Plan should still resolve all 5 models as internal after create_external_models
     context.load()