Added Docker Registry View tests

app/controllers/jwt_controller.rb

...services/jwt/container_registry_authentication_service.rb

app/services/projects/destroy_service.rb

app/views/projects/container_registry/_tag.html.haml

app/views/projects/container_registry/index.html.haml

lib/container_registry/client.rb

spec/features/container_registry_spec.rb

spec/fixtures/container_registry/config_blob.json

spec/fixtures/container_registry/tag_manifest.json

spec/support/stub_gitlab_calls.rb