test: remove test_connector_with_credentials system test (#1255)

Author: kgala2

tests/system/test_connector_object.py

@@ -20,7 +20,6 @@
 import os
 from threading import Thread
 
-import google.auth
 import pymysql
 import pytest
 import sqlalchemy
@@ -50,20 +49,6 @@ def getconn() -> pymysql.connections.Connection:
     return pool
 
 
-def test_connector_with_credentials() -> None:
-    """Test Connector object connection with credentials loaded from file."""
-    credentials, _ = google.auth.load_credentials_from_file(
-        os.environ["GOOGLE_APPLICATION_CREDENTIALS"]
-    )
-    with Connector(credentials=credentials) as connector:
-        pool = init_connection_engine(connector)
-
-        with pool.connect() as conn:
-            result = conn.execute(sqlalchemy.text("SELECT 1")).fetchone()
-            assert isinstance(result[0], int)
-            assert result[0] == 1
-
-
 def test_multiple_connectors() -> None:
     """Test that same Cloud SQL instance can connect with two Connector objects."""
     first_connector = Connector()