feat(css): Add utility classes
What does this MR do?
As part of working on customers-gitlab-com#2005 (closed), I've realized I added some wrong utility classes to gitlab-ui, classes which I intend to remove and replace with the correct ones.
Added classes
gl-pt-12
gl-md-pt-12
gl-pb-11
Does this MR meet the acceptance criteria?
Conformity
Edited by Andrei Stoicescu