Add check for packages restricting Python version (#145690)

* Add check for packages restricting Python version

* Apply suggestions from code review

* until

* until

script/hassfest/model.py

@@ -222,6 +222,15 @@ class Integration:
         """Add a warning."""
         self.warnings.append(Error(*args, **kwargs))
 
+    def add_warning_or_error(
+        self, warning_only: bool, *args: Any, **kwargs: Any
+    ) -> None:
+        """Add an error or a warning."""
+        if warning_only:
+            self.add_warning(*args, **kwargs)
+        else:
+            self.add_error(*args, **kwargs)
+
     def load_manifest(self) -> None:
         """Load manifest."""
         manifest_path = self.path / "manifest.json"