Changed mr widget build status to pipeline status

## What does this MR do?

Changed mr widget build status to pipeline status with pipeline id, with a link to the pipeline.

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

Do we want the link to the pipeline?

/cc @dimitrieh 

## Screenshots (if relevant)

![Screen_Shot_2016-09-14_at_02.42.23](/uploads/94a860361ab70eccf966e519764c6ec5/Screen_Shot_2016-09-14_at_02.42.23.png)

## Does this MR meet the acceptance criteria?

- [ ] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry 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 you do - 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?

Closes #22006

See merge request !6335