Geo: send the new event type with the backfill function

Use the new event type introduced by !1015 (merged). This will make, pressing the backfill button in Geo (#76 (closed)) actually start backfilling the repositories again.

Closes #1645 (closed)

spec/requests/api/geo_spec.rb

@@ -63,6 +63,7 @@ describe API::Geo, api: true do
 
   describe 'POST /geo/receive_events push events' do
     before(:each) { allow_any_instance_of(::Geo::ScheduleRepoUpdateService).to receive(:execute) }
+    before(:each) { allow_any_instance_of(::Geo::ScheduleRepoFetchService).to receive(:execute) }
 
     let(:push_payload) do
       {