Merge branch '22472-wrong-table-head' into 'master'

Fix pipelines table headers

## What does this MR do?

Removed stages loop for a single 'Stages' header.

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

## Why was this MR needed?

The headers were messing the table up. Note the redundant headers and squished cells.

![Screen_Shot_2016-09-27_at_14.40.51](/uploads/331b08c30a4af59cefc460ab4f3c2a61/Screen_Shot_2016-09-27_at_14.40.51.png)

## Screenshots (if relevant)

![Screen_Shot_2016-09-27_at_14.39.04](/uploads/687895e9152d4fe8d8f3bfc1233af39b/Screen_Shot_2016-09-27_at_14.39.04.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 #22472

See merge request !6542

app/views/projects/commit/_pipelines_list.haml

@@ -8,13 +8,7 @@
         %tbody
           %th Status
           %th Commit
-          - pipelines.stages.each do |stage|
-            %th.stage
-              - if stage.titleize.length > 12
-                %span.has-tooltip{ title: "#{stage.titleize}" }
-                  = stage.titleize
-              - else
-                = stage.titleize
+          %th Stages
           %th
           %th
         = render pipelines, commit_sha: true, stage: true, allow_retry: true, stages: pipelines.stages, status_icon_only: true, hide_branch: true