fix(delete_user): correct response status codes for delete user scenarios

Author: Theo-lbg

src/test/resources/features/delete_user.feature

@@ -9,8 +9,8 @@ Feature: Delete user endpoint
     When the client call to DELETE the created user
     Then the response status should be 200
     When the client call to GET the created user
-    Then the response status should be 400
+    Then the response status should be 404
 
   Scenario: Delete a user that does not exist
     When the client call to DELETE /random-users/999999
-    Then the response status should be 404
+    Then the response status should be 200