feat: persist and edit versioned workflow definitions

tests/test_manifest.py

@@ -26,6 +26,17 @@ class WorkflowManifestTests(unittest.TestCase):
             DEFINITION_WRITE_SCOPE,
             {item.scope for item in manifest.permissions},
         )
+        self.assertEqual(
+            "@govoplan/workflow-webui",
+            manifest.frontend.package_name if manifest.frontend else None,
+        )
+        self.assertIsNotNone(manifest.migration_spec)
+        requirement = next(
+            item
+            for item in manifest.requires_interfaces
+            if item.name == "dataflow.run_lifecycle"
+        )
+        self.assertTrue(requirement.optional)
 
 
 if __name__ == "__main__":