Add latest changes from gitlab-org/gitlab@12-9-stable-ee

changelogs/unreleased/rc-whitelist_ports.yml

changelogs/unreleased/refactor-bypass-session-admin-mode.yml

...s/unreleased/refactor-disable-csrf-in-session-destroy.yml

changelogs/unreleased/remove-cs-kubernetes-workaround.yml

...eased/remove-duplicate-auth-refresh-on-project-create.yml

changelogs/unreleased/remove-merged-branch-names-ff.yml

...unreleased/remove-puma-notices-from-admin-area-banner.yml

changelogs/unreleased/replace-undefined-with-unknown.yml

...eleased/replace-undefined-with-unkown-vulnerabilities.yml

...unreleased/replace_checkbox_by_toggle_for_modsecurity.yml

...ogs/unreleased/repository-contributors-group-by-email.yml

changelogs/unreleased/requirements-model.yml

changelogs/unreleased/rk4bir-master-patch-60164.yml

changelogs/unreleased/rk4bir-master-patch-77755.yml

changelogs/unreleased/rk4bir-master-patch-85217.yml

changelogs/unreleased/rk4bir-master-patch-92247.yml

changelogs/unreleased/rk4bir-master-patch-97031.yml

changelogs/unreleased/rs-commit-web_url.yml

changelogs/unreleased/rs-keep-divergent-refs-column.yml

changelogs/unreleased/rs-remote-mirrors-docs.yml