Add count of projects with at least one package to a usage ping data

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

ee/changelogs/unreleased/8320-add-usage-ping-for-package-management.yml

+---
+title: Add count of projects with at least one package to a usage ping data
+merge_request: 8641
+author:
+type: other

ee/lib/ee/gitlab/usage_data.rb

@@ -100,7 +100,8 @@ module EE
           ldap_users: count(::User.ldap),
           projects_reporting_ci_cd_back_to_github: count(::GithubService.without_defaults.active),
           projects_mirrored_with_pipelines_enabled: projects_mirrored_with_pipelines_enabled,
-          projects_with_prometheus_alerts: count(PrometheusAlert.distinct_projects)
+          projects_with_prometheus_alerts: count(PrometheusAlert.distinct_projects),
+          projects_with_packages: count(::Packages::Package.select('distinct project_id'))
         }).merge(service_desk_counts).merge(security_products_usage)
 
         usage_data

ee/spec/lib/gitlab/usage_data_spec.rb

@@ -18,6 +18,10 @@ describe Gitlab::UsageData do
       create(:prometheus_alert, project: projects[0])
       create(:prometheus_alert, project: projects[0])
       create(:prometheus_alert, project: projects[1])
+
+      create(:package, project: projects[0])
+      create(:package, project: projects[0])
+      create(:package, project: projects[1])
     end
 
     subject { described_class.data }
@@ -59,9 +63,11 @@ describe Gitlab::UsageData do
         license_management_jobs
         sast_jobs
         projects_with_prometheus_alerts
+        projects_with_packages
       ))
 
       expect(count_data[:projects_with_prometheus_alerts]).to eq(2)
+      expect(count_data[:projects_with_packages]).to eq(2)
     end
 
     it 'gathers security products usage data' do