Add pipeline quota to user settings

Closes #3154 (closed)

@hazelyang this was an item I forgot to add to the list of icons needed. I re-used the pipelines icon; does that work?

@annabeldunstone It works! Thanks!

@iamphill can you please review?

assigned to @iamphill

approved this merge request

mentioned in commit 0a365bda

merged

mentioned in commit cd7e3409

Picked into https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/2680, will merge into 9-5-stable-ee ready for 9.5 RC3

removed Pick into Stable label