Update usage ping to use Issue incident spec

lib/gitlab/usage_data.rb

@@ -121,7 +121,7 @@ module Gitlab
             issues_created_from_alerts: total_alert_issues,
             issues_created_gitlab_alerts: issues_created_manually_from_alerts,
             issues_created_manually_from_alerts: issues_created_manually_from_alerts,
-            incident_issues: alert_bot_incident_count,
+            incident_issues: count(::Issue.incident),
             alert_bot_incident_issues: alert_bot_incident_count,
             incident_labeled_issues: count(::Issue.with_label_attributes(::IncidentManagement::CreateIncidentLabelService::LABEL_PROPERTIES), start: issue_minimum_id, finish: issue_maximum_id),
             keys: count(Key),

spec/factories/usage_data.rb

@@ -31,8 +31,8 @@ FactoryBot.define do
       create(:project_error_tracking_setting, project: projects[1], enabled: false)
       create(:alerts_service, project: projects[0])
       create(:alerts_service, :inactive, project: projects[1])
-      alert_bot_issues = create_list(:issue, 2, project: projects[0], author: User.alert_bot)
-      create_list(:issue, 2, project: projects[1], author: User.alert_bot)
+      alert_bot_issues = create_list(:incident, 2, project: projects[0], author: User.alert_bot)
+      create_list(:incident, 2, project: projects[1], author: User.alert_bot)
       issues = create_list(:issue, 4, project: projects[0])
       create_list(:prometheus_alert, 2, project: projects[0])
       create(:prometheus_alert, project: projects[1])