Quarantine prevalent failing QA tests

register_spec and file_locking_spec

qa/qa/specs/features/browser_ui/1_manage/login/register_spec.rb

@@ -13,7 +13,7 @@ module QA
     end
   end
 
-  RSpec.describe 'Manage', :skip_signup_disabled, :requires_admin do
+  RSpec.describe 'Manage', :skip_signup_disabled, :requires_admin, quarantine: { issue: 'https://gitlab.com/gitlab-org/gitlab/-/issues/349626', type: :stale } do
     describe 'while LDAP is enabled', :orchestrated, :ldap_no_tls, testcase: 'https://gitlab.com/gitlab-org/gitlab/-/quality/test_cases/347934' do
       before do
         # When LDAP is enabled, a previous test might have created a token for the LDAP 'tanuki' user who is not an admin

qa/qa/specs/features/ee/browser_ui/3_create/repository/file_locking_spec.rb

 # frozen_string_literal: true
 
 module QA
-  RSpec.describe 'Create' do
+  RSpec.describe 'Create', quarantine: { issue: 'https://gitlab.com/gitlab-org/gitlab/-/issues/349898', type: :stale } do
     describe 'File Locking' do
       let(:user_one) { Resource::User.fabricate_or_use(Runtime::Env.gitlab_qa_username_1, Runtime::Env.gitlab_qa_password_1) }
       let(:user_two) { Resource::User.fabricate_or_use(Runtime::Env.gitlab_qa_username_2, Runtime::Env.gitlab_qa_password_2) }