feat(css): added missing width utility mixins

mentioned in commit 807dee68

mentioned in merge request status-page!748 (merged)

mentioned in merge request gitlab!116201 (closed)

mentioned in merge request gitlab!116736 (merged)

mentioned in merge request gitlab-org/frontend/pajamas-adoption-scanner!133 (merged)

mentioned in merge request gitlab!116885 (merged)

mentioned in merge request gitlab!117076 (merged)

mentioned in merge request gitlab-docs!3751 (merged)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!3341 (merged)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!3342 (merged)