Part of Pajamas migration day.

Changelog: changed

Migrate rails eval'ed js to form event listeners

See https://gitlab.com/gitlab-org/frontend/eslint-plugin/-/issues/18
for more information.

Refactor the integration views of the
profile/preferences page to Vue (from HAML), so
we can achieve these goals:

https://gitlab.com/gitlab-com/www-gitlab-com/-/issues/8765
https://gitlab.com/gitlab-org/gitlab/-/issues/259621
https://gitlab.com/gitlab-org/gitlab/-/issues/250846