feat: Normalize project and location in connection IDs

Author: shuoweil

tests/system/conftest.py

@@ -72,16 +72,16 @@ def _hash_digest_file(hasher, filepath):
 
 @pytest.fixture(scope="session")
 def normalize_connection_id():
-    """Normalizes the connection ID by casefolding only the LOCATION component.
+    """Normalizes the connection ID by casefolding the PROJECT and LOCATION components.
 
     Connection format: PROJECT.LOCATION.CONNECTION_NAME
-    Only LOCATION is case-insensitive; PROJECT and CONNECTION_NAME must be lowercase.
+    PROJECT and LOCATION are case-insensitive; CONNECTION_NAME must be lowercase.
     """
 
     def normalize(connection_id: str) -> str:
         parts = connection_id.split(".")
         if len(parts) == 3:
-            return f"{parts[0]}.{parts[1].casefold()}.{parts[2]}"
+            return f"{parts[0].casefold()}.{parts[1].casefold()}.{parts[2]}"
         return connection_id  # Return unchanged if invalid format
 
     return normalize