Quarantine git protocol v2 tests

qa/qa/specs/features/browser_ui/3_create/repository/protocol_v2_push_http_spec.rb

 # frozen_string_literal: true
 module QA
-  context 'Create' do
+  # Git protocol v2 is temporarily disabled
+  # https://gitlab.com/gitlab-org/gitlab-ce/issues/55769 (confidential)
+  context 'Create', :quarantine do
     describe 'Push over HTTP using Git protocol version 2', :requires_git_protocol_v2 do
       it 'user pushes to the repository' do
         Runtime::Browser.visit(:gitlab, Page::Main::Login)

qa/qa/specs/features/browser_ui/3_create/repository/protocol_v2_push_ssh_spec.rb

 # frozen_string_literal: true
 module QA
-  context 'Create' do
+  # Git protocol v2 is temporarily disabled
+  # https://gitlab.com/gitlab-org/gitlab-ce/issues/55769 (confidential)
+  context 'Create', :quarantine do
     describe 'Push over SSH using Git protocol version 2', :requires_git_protocol_v2 do
       # Note: If you run this test against GDK make sure you've enabled sshd and
       # enabled setting the Git protocol by adding `AcceptEnv GIT_PROTOCOL` to