Move the prefile event and add a new error exception (#1111)

* Move the prefile event and add a new error exception

* Remove extra import

* Add empty handler for testing

* Fix styling

* Fix styleci

app/Services/PirepService.php

@@ -6,6 +6,7 @@ use App\Contracts\Service;
 use App\Events\PirepAccepted;
 use App\Events\PirepCancelled;
 use App\Events\PirepFiled;
+use App\Events\PirepPrefiled;
 use App\Events\PirepRejected;
 use App\Events\UserStatsChanged;
 use App\Exceptions\AircraftInvalid;
@@ -151,6 +152,8 @@ class PirepService extends Service
             }
         }
 
+        event(new PirepPrefiled($pirep));
+
         $pirep->save();
 
         return $pirep;