Set page title in project - container registry

- Set page title with i18n
- feature test to verify the page title presence
- changelog entry 

app/views/projects/registry/repositories/index.html.haml

+- page_title _("Container Registry")
+
 %section
   .row.registry-placeholder.prepend-bottom-10
     .col-12

changelogs/unreleased/33322-missing-page-title-on-projects-container-registry.yml

+---
+title: Add missing page title to projects/container-registry
+merge_request: 18114
+author:
+type: changed

spec/features/container_registry_spec.rb

@@ -17,6 +17,11 @@ describe 'Container Registry', :js do
     stub_container_registry_tags(repository: :any, tags: [])
   end
 
+  it 'has a page title set' do
+    visit_container_registry
+    expect(page).to have_title(_('Container Registry'))
+  end
+
   context 'when there are no image repositories' do
     it 'user visits container registry main page' do
       visit_container_registry