feat: remove errors that should never happen

400: useless for a GET request
401: handled by API-Gateway

spec/endpoints/destinations/index.yml

@@ -21,25 +21,12 @@ get:
           examples:
             example-1:
               $ref: '../../examples/destination-list.yml'
-    '400':
-      description: Bad Request
-      content:
-        application/problem+json:
-          schema:
-            $ref: '../../schemas/error.yml'
-    '401':
-      description: Unauthorized
-      content:
-        application/problem+json:
-          schema:
-            $ref: '../../schemas/error.yml'
     '403':
       description: Forbidden
       content:
         application/problem+json:
           schema:
             $ref: '../../schemas/error.yml'
-
 post:
   operationId: create-destination
   summary: Zustellpunkt anlegen