Ensure namespace/project used minutes are reset

Do not rely on whether we have sent a notification
to the customre or not.

This solution may be less performant but ensures
we always reset the minutes for all namespaces.

ee/app/workers/clear_shared_runners_minutes_worker.rb

@@ -15,11 +15,13 @@ class ClearSharedRunnersMinutesWorker
       .update_all("extra_shared_runners_minutes_limit = #{extra_minutes_left_sql} FROM namespace_statistics")
 
     Namespace.with_ci_minutes_notification_sent.each_batch do |namespaces|
+      namespaces.update_all(last_ci_minutes_notification_at: nil, last_ci_minutes_usage_notification_level: nil)
+    end
+
+    Namespace.each_batch do |namespaces|
       Namespace.transaction do
         reset_statistics(NamespaceStatistics, namespaces)
         reset_statistics(ProjectStatistics, namespaces)
-
-        namespaces.update_all(last_ci_minutes_notification_at: nil, last_ci_minutes_usage_notification_level: nil)
       end
     end
   end

ee/spec/workers/clear_shared_runners_minutes_worker_spec.rb

@@ -4,7 +4,7 @@ describe ClearSharedRunnersMinutesWorker do
   let(:worker) { described_class.new }
 
   describe '#perform' do
-    let(:namespace) { create(:namespace, last_ci_minutes_notification_at: Time.now) }
+    let(:namespace) { create(:namespace) }
 
     before do
       expect_any_instance_of(described_class)