Quarantine dependency proxy spec on Staging

It fails due to disabled FF
Signed-off-by: Nailia Iskhakova <niskhakova@gitlab.com>

qa/qa/specs/features/ee/browser_ui/5_package/dependency_proxy_sso_spec.rb

 # frozen_string_literal: true
 
 module QA
-  RSpec.describe 'Package', :orchestrated, :group_saml, :requires_admin do
+  # This test is disabled on staging and production due to `top_level_group_creation_enabled` set to false.
+  # See: https://gitlab.com/gitlab-org/gitlab/-/issues/342329#note_696599160
+  # When FF enabled, the test is failing with https://gitlab.com/gitlab-org/gitlab/-/issues/342523
+  RSpec.describe 'Package', :orchestrated, :group_saml, :requires_admin, quarantine: { only: [:staging, :production], issue: 'https://gitlab.com/gitlab-org/gitlab/-/issues/342523', type: :investigating } do
     describe 'Dependency Proxy Group SSO' do
       include Support::API