Update button variants and alignment to align with the Pajamas Design System...

Update button variants and alignment to align with the Pajamas Design System and modify the avatar layout to have better flow.

This change was first introduced in merge request
https://gitlab.com/gitlab-org/gitlab/-/merge_requests/61504.

Changelog: other

changelogs/unreleased/273315-fy21q4-foundations-kr2-audit-and-update-buttons-on-profilescontrol.yml

----
-title: Update button variants and alignment to align with the Pajamas Design System
-  and modify the avatar layout to have better flow.
-merge_request: 61504
-author:
-type: other