Draft: GitLab UI integration branch for form-input-select-replace-size-prop-with-width

What does this MR do and why?

Integration branch of gitlab-ui!3612 (merged)

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. yarn install
2. Vue integration example: http://gdk.test:3000/admin/application_settings/repository
   1. Click on Repository maintenance
   2. Click on Delete inactive projects
   3. Check form fields (md & sm sizes)

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.