Fix order-dependent spec failure in imap_authentication_check_spec.rb
When spec/lib/gitlab/mail_room/mail_room_spec.rb
is run before
spec/lib/system_check/incoming_email/imap_authentication_check_spec.rb
,
Gitlab::MailRoom.enabled_configs
leaks state from one test to another.
To fix this, we should clean up the instance variable after the tests finish.
Closes #332706 (closed)
Edited by Stan Hu