Fix registry related tests

qa/qa/specs/features/browser_ui/5_package/container_registry/container_registry_omnibus_spec.rb

 # frozen_string_literal: true
 
 module QA
-  RSpec.describe 'Package', :orchestrated do
+  RSpec.describe 'Package', :orchestrated, only: { pipeline: :main } do
     describe 'Self-managed Container Registry' do
       let(:project) do
         Resource::Project.fabricate_via_api! do |project|

qa/qa/specs/features/browser_ui/5_package/dependency_proxy/dependency_proxy_spec.rb

 # frozen_string_literal: true
 
 module QA
-  RSpec.describe 'Package', :orchestrated, :registry do
+  RSpec.describe 'Package', :orchestrated, :registry, only: { pipeline: :main } do
     describe 'Dependency Proxy' do
       let(:project) do
         Resource::Project.fabricate_via_api! do |project|