Ensure that for import we insert records in the correct order

This ensures we do not try to load exposure before we've loaded
day_obs.

python/lsst/daf/butler/transfers/_yaml.py

@@ -519,7 +519,9 @@ def load(
         skip_dimensions: set | None = None,
     ) -> None:
         # Docstring inherited from RepoImportBackend.load.
-        for element, dimensionRecords in self.dimensions.items():
+        # Must ensure we insert in order supported by the universe.
+        for element in self.registry.dimensions.sorted(self.dimensions.keys()):
+            dimensionRecords = self.dimensions[element]
             if skip_dimensions and element in skip_dimensions:
                 continue
             # Using skip_existing=True here assumes that the records in the