Add latest changes from gitlab-org/gitlab@master

DUO_WORKFLOW_EXECUTOR_VERSION

...components/design_management/design_management_widget.vue

doc/api/deploy_keys.md

...user/packages/package_registry/dependency_proxy/_index.md

...ser/packages/package_registry/package_protection_rules.md

...kages/package_registry/reduce_package_registry_storage.md

doc/user/packages/workflows/build_packages.md

doc/user/packages/workflows/project_registry.md

qa/Gemfile

qa/Gemfile.lock