Fix spacing and vertical alignment on build status icon on commits page

## What does this MR do?
Fixes the hover state of the build status text and adds extra margin and vertically aligns the build status icon

## Are there points in the code the reviewer needs to double check?
Shouldn't be

## Why was this MR needed?
Improves existing UI

## What are the relevant issue numbers?
Closes #20642 

## Screenshots (if relevant)
Before:
![Screen_Shot_2016-08-09_at_12.07.50_PM](/uploads/5265c00077eeef8fc42e08e89555bfb7/Screen_Shot_2016-08-09_at_12.07.50_PM.png)
![Screen_Shot_2016-08-09_at_12.07.59_PM](/uploads/dc5cf7e09785ac394b264a47c594cf98/Screen_Shot_2016-08-09_at_12.07.59_PM.png)

After:
![Screen_Shot_2016-08-09_at_12.05.45_PM](/uploads/c0ce182c6342a7db767d1932372991d0/Screen_Shot_2016-08-09_at_12.05.45_PM.png)
![Screen_Shot_2016-08-09_at_12.05.37_PM](/uploads/e337ff23462552f75760f80087a2b1ef/Screen_Shot_2016-08-09_at_12.05.37_PM.png)

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- Tests
  - [x] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !5739