Update to node@18 across the codebase
We should update to node@18 across the code base
GitLab:
* [x] [GitLab CI Images](https://gitlab.com/gitlab-org/gitlab-build-images) - https://gitlab.com/gitlab-org/gitlab-build-images/-/merge_requests/620
* [x] Updating GitLab CI - https://gitlab.com/gitlab-org/gitlab/-/merge_requests/106898
* [x] Build images: [Drop node@16 once everything is upgraded](https://gitlab.com/gitlab-org/gitlab-build-images/-/merge_requests/724).
* [x] [GitLab Compose Kit](https://gitlab.com/gitlab-org/gitlab-compose-kit) - https://gitlab.com/gitlab-org/gitlab-compose-kit/-/merge_requests/241
* [x] [GDK](https://gitlab.com/gitlab-org/gitlab-development-kit): https://gitlab.com/gitlab-org/gitlab-development-kit/-/merge_requests/3151
* [x] [GitLab Omnibus Builder](https://gitlab.com/gitlab-org/gitlab-omnibus-builder): https://gitlab.com/gitlab-org/gitlab-omnibus-builder/-/merge_requests/285
* [x] [CNG](https://gitlab.com/gitlab-org/build/CNG): https://gitlab.com/gitlab-org/build/CNG/-/merge_requests/1410
* [x] [omnibus](https://gitlab.com/gitlab-org/omnibus-gitlab): https://gitlab.com/gitlab-org/omnibus-gitlab/-/merge_requests/7117
* [x] [CustomersDot](https://gitlab.com/gitlab-org/customers-gitlab-com): https://gitlab.com/gitlab-org/customers-gitlab-com/-/merge_requests/7339
Other Projects:
* [x] [GitLab UI](https://gitlab.com/gitlab-org/gitlab-ui) – https://gitlab.com/gitlab-org/gitlab-ui/-/merge_requests/3402
* [X] [GitLab docs](https://gitlab.com/gitlab-org/gitlab-docs) - https://gitlab.com/gitlab-org/gitlab-docs/-/merge_requests/3512
* [x] [SVGs](https://gitlab.com/gitlab-org/gitlab-svgs) - https://gitlab.com/gitlab-org/gitlab-svgs/-/merge_requests/912
* [x] [Status Page](https://gitlab.com/gitlab-org/status-page) - https://gitlab.com/gitlab-org/status-page/-/merge_requests/790
* [x] [design.gitlab.com](https://gitlab.com/gitlab-org/gitlab-services/design.gitlab.com) – https://gitlab.com/gitlab-org/gitlab-services/design.gitlab.com/-/merge_requests/3395
* [x] [Eslint plugin](https://gitlab.com/gitlab-org/frontend/eslint-plugin) - https://gitlab.com/gitlab-org/frontend/eslint-plugin/-/merge_requests/106
* [x] [Webpack memory metrics](https://gitlab.com/gitlab-org/frontend/playground/webpack-memory-metrics) - https://gitlab.com/gitlab-org/frontend/playground/webpack-memory-metrics/-/merge_requests/36
* [x] [Renovate Bot](https://gitlab.com/gitlab-org/frontend/renovate-gitlab-bot/) - https://gitlab.com/gitlab-org/frontend/renovate-gitlab-bot/-/merge_requests/676
* [x] [stylelint config](https://gitlab.com/gitlab-org/frontend/gitlab-stylelint-config) - https://gitlab.com/gitlab-org/frontend/gitlab-stylelint-config/-/merge_requests/31
epic