This reverts merge request !28545

This is a CSS effort only.

Fixes the padding of the buttons to be `8px 12px`
(including border) so that the button height is
32px.

Also adjusts the border width for all buttons when
the state is `hover`, `focus`, or `active to be 2px
thick instead of 1px thick. This is accomplished
through an inset box-shadow as not to increase
the size of the button.

Fixes some colors for primary and tertiary buttons.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/64340

https://gitlab.com/gitlab-org/gitlab-ce/issues/58583

Also fixes flaky spec

This reverts commit 171818df.

This reverts commit 6c75bd01, reversing
changes made to 1be7f5aa.

Regenerate locale.pot as well

Remove jquery.scss; Combine multiple duplicate grays into global gray variables; Remove unused styles in common.scss

Closes #49382.