Add latest changes from gitlab-org/gitlab@master

.rubocop_todo.yml

GITALY_SERVER_VERSION

...s/javascripts/notes/components/diff_discussion_header.vue

app/assets/javascripts/packages/details/store/getters.js

app/controllers/application_controller.rb

app/graphql/types/notes/noteable_type.rb

app/models/project_services/drone_ci_service.rb

app/views/projects/blob/_editor.html.haml

app/views/projects/blob/_new_dir.html.haml

app/views/projects/blob/_remove.html.haml

app/views/projects/blob/_upload.html.haml

app/views/projects/blob/_viewer_switcher.html.haml

app/views/projects/feature_flags/edit.html.haml

changelogs/unreleased/42916-pypi-install-command.yml

changelogs/unreleased/42917_golang_vendor_templates.yml

changelogs/unreleased/gitlab_buttons_projects_blob.yml

...eased/mk-enforce-not-null-file-store-on-package-files.yml

changelogs/unreleased/rails-save-bang-36.yml

...200915185707_ensure_filled_file_store_on_package_files.rb

...15191156_validate_not_null_file_store_on_package_files.rb