refactor(DB): make integration fields optional

Signed-off-by: miguel456 <me@nogueira.codes>

app/Http/Requests/VacancyRequest.php

@@ -46,8 +46,8 @@ class VacancyRequest extends FormRequest
             'vacancyName' => 'required|string',
             'vacancyDescription' => 'required|string',
             'vacancyFullDescription' => 'nullable|string',
-            'permissionGroup' => 'required|string',
-            'discordRole' => 'required|string',
+            'permissionGroup' => 'nullable|string',
+            'discordRole' => 'nullable|string',
             'vacancyCount' => 'required|integer',
             'vacancyFormID' => 'required|integer',
         ];