Last minute CI Style tweaks for 8.14

## What does this MR do?
- Skipped builds now have use a lighter gray.
- Converted all status icons to be managed by scss colors only
- Consolidated all status icon styles into icons.scss
- Deleted any classes or styles within the svg's
- Gave status badges a hover style, but only if clickable
- Fixed alignment issue mini-pipeline graph

## Are there points in the code the reviewer needs to double check?

## Why was this MR needed?
As per the discussion in the slack chat https://gitlab.slack.com/archives/ci/p1479743986004879

## Screenshots (if relevant)
- skipped builds:
![image](/uploads/f59c615045472b9b13940463a64c8038/image.png)
![image](/uploads/26503d1da9c93b3c22c5c0c1369feceb/image.png)

- hover style status badges:
![2016-11-22_00.21.27](/uploads/36afa7aa64d60e1755bf39d97f90c59f/2016-11-22_00.21.27.gif)![2016-11-22_00.58.38](/uploads/1d95fa5db124412d3f83b3e79b9b71ec/2016-11-22_00.58.38.gif)

- mini pipeline graph:

before:
![image](/uploads/38e5e57ada3907b17c6e24e1446b4514/image.png)


after:
![image](/uploads/de4476693a1397eebfc680661159daf7/image.png)


## Does this MR meet the acceptance criteria?

- [x] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [ ] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

See merge request !7643