Add github imported projects count to usage data

changelogs/unreleased/34563-usage-ping-github.yml

+---
+title: Add GitHub imported projects count to usage data
+merge_request:
+author:

lib/gitlab/usage_data.rb

@@ -39,6 +39,7 @@ module Gitlab
             notes: Note.count,
             pages_domains: PagesDomain.count,
             projects: Project.count,
+            projects_imported_from_github: Project.where(import_type: 'github').count,
             projects_prometheus_active: PrometheusService.active.count,
             protected_branches: ProtectedBranch.count,
             releases: Release.count,

spec/lib/gitlab/usage_data_spec.rb

@@ -48,6 +48,7 @@ describe Gitlab::UsageData do
         milestones
         notes
         projects
+        projects_imported_from_github
         projects_prometheus_active
         pages_domains
         protected_branches