Update test_disabled_metric_ref_model to have more disabled metrics

There are metrics which depend on the metric `number_of_people`. If
`number_of_people` is disabled without the metrics that depend on it
being disabled, then a different (expected) exception would be raised
than the one this test is testing for. Thus we've disabled those
downstream metrics.

tests/functional/metrics/test_metric_configs.py

@@ -122,13 +122,21 @@ def test_disabled_metric_ref_model(self, project):
         assert "metric.test.number_of_people" in manifest.metrics
         assert "metric.test.collective_tenure" in manifest.metrics
         assert "model.test.people_metrics" in manifest.nodes
+        assert "metric.test.average_tenure" in manifest.metrics
+        assert "metric.test.average_tenure_minus_people" in manifest.metrics
 
         new_enabled_config = {
             "metrics": {
                 "test": {
                     "number_of_people": {
                         "enabled": False,
                     },
+                    "average_tenure_minus_people": {
+                        "enabled": False,
+                    },
+                    "average_tenure": {
+                        "enabled": False,
+                    },
                 }
             }
         }