Add (Istio) MCP tests to the testgrid dashboard.
Add (Istio) MCP tests to the testgrid dashboard.

GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid