Add latest changes from gitlab-org/gitlab@master

app/views/devise/shared/_omniauth_box.html.haml

app/views/projects/import/jira/show.html.haml

app/views/projects/issues/import_csv/_button.html.haml

app/views/projects/tags/new.html.haml

app/views/u2f/_authenticate.html.haml

app/workers/all_queues.yml

app/workers/authorized_projects_worker.rb

changelogs/unreleased/196609-remove-staging.yml

...unreleased/198050-frontend-pagination-in-log-explorer.yml

changelogs/unreleased/208890-optimize-notes-counters.yml

...gelogs/unreleased/55487-backfill-lfs-objects-projects.yml

changelogs/unreleased/feat-2fa-for-admin-mode.yml

changelogs/unreleased/nfriend-create-release-through-ui.yml

...released/update-ruby-version-on-official-ci-templates.yml

config/routes/project.rb

..._add_index_on_author_id_and_id_and_created_at_to_notes.rb

...rate/20200310075115_schedule_link_lfs_objects_projects.rb

db/schema.rb

doc/api/graphql/reference/gitlab_schema.json

doc/development/api_graphql_styleguide.md