Run Geo check from GitLab check if enabled

ee/changelogs/unreleased/mk-refactor-gitlab-check-rake-tasks.yml

+---
+title: Run geo check task from gitlab check
+merge_request: 8616
+author:
+type: changed

ee/lib/ee/system_check/rake_task/gitlab_task.rb

+# frozen_string_literal: true
+
+module EE
+  module SystemCheck
+    module RakeTask
+      module GitlabTask
+        extend ActiveSupport::Concern
+
+        class_methods do
+          extend ::Gitlab::Utils::Override
+
+          override :subtasks
+          def subtasks
+            existing = super
+
+            existing << ::SystemCheck::RakeTask::GeoTask if ::Gitlab::Geo.enabled?
+
+            existing
+          end
+        end
+      end
+    end
+  end
+end

lib/system_check/rake_task/gitlab_task.rb

@@ -31,3 +31,5 @@ module SystemCheck
     end
   end
 end
+
+SystemCheck::RakeTask::GitlabTask.prepend(EE::SystemCheck::RakeTask::GitlabTask)