Quarantine failing ssh key test

qa/qa/specs/features/browser_ui/3_create/repository/use_ssh_key_spec.rb

 # frozen_string_literal: true
 module QA
-  context 'Create' do
+  # Failure issue: https://gitlab.com/gitlab-org/quality/nightly/issues/84
+  context 'Create', :quarantine do
     describe 'SSH key support' do
       # Note: If you run this test against GDK make sure you've enabled sshd
       # See: https://gitlab.com/gitlab-org/gitlab-qa/blob/master/docs/run_qa_against_gdk.md