Remove monitor flags for aggregate counters

config/feature_flags/development/usage_data_incident_management_alerts_total_unique_counts.yml

----
-name: usage_data_incident_management_alerts_total_unique_counts
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/48087
-rollout_issue_url:
-milestone: '13.7'
-type: development
-group: group::monitor
-default_enabled: false

config/feature_flags/development/usage_data_incident_management_incidents_total_unique_counts.yml

----
-name: usage_data_incident_management_incidents_total_unique_counts
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/48087
-rollout_issue_url:
-milestone: '13.7'
-type: development
-group: group::monitor
-default_enabled: false

lib/gitlab/usage_data_counters/aggregated_metrics/common.yml

@@ -22,7 +22,6 @@
     'incident_management_alert_todo',
     'incident_management_alert_create_incident'
   ]
-  feature_flag: usage_data_incident_management_alerts_total_unique_counts
 - name: incident_management_incidents_total_unique_counts
   operator: OR
   events: [
@@ -38,4 +37,3 @@
     'incident_management_incident_unrelate',
     'incident_management_incident_change_confidential'
   ]
-  feature_flag: usage_data_incident_management_incidents_total_unique_counts