## Is your feature request related to a problem?

I want to run experiments on groups

## Describe the solution you'd like

Experiments support group target metrics, and the FF respects group selection.


## Describe alternatives you've considered

No groups :(

## Additional context



#### *Thank you* for your feature request – we love each and every one!

ee/clickhouse/views/test/test_clickhouse_experiments.py
ff_key = "a-b-test"
        FeatureFlag.objects.create(
            team=self.team, rollout_percentage=50, name="Beta feature", key=ff_key, created_by=self.user,
        )
        response = self.client.post(
            f"/api/projects/{self.team.id}/experiments/",
            {
                "name": "Test Experiment",
                "description": "",
                "start_date": "2021-12-01T10:23",
                "end_date": None,
                "feature_flag_key": ff_key,
                "parameters": None,
                "filters": {"events": []},
            },
        )
        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
        self.assertEqual(response.json()["detail"], "There is already a feature flag with this key.")
    def test_draft_experiment_doesnt_have_FF_active(self):