chore: add aiplatform.init back to model monitoring system tests (googleapis#1633)

* chore: add aiplatform.init back to model monitoring system tests

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tests/system/aiplatform/test_model_monitoring.py

@@ -99,6 +99,7 @@
 
 class TestModelDeploymentMonitoring(e2e_base.TestEndToEnd):
     _temp_prefix = "temp_e2e_model_monitoring_test_"
+    aiplatform.init(project=e2e_base._PROJECT, location=e2e_base._LOCATION)
     endpoint = aiplatform.Endpoint(PERMANENT_CHURN_ENDPOINT_ID)
 
     def test_mdm_two_models_one_valid_config(self):