Merge branch '25055-pipelines-info-missing-from-mr-widget' into 'master'

Fix pipelines info being hidden in merge request widget

## What does this MR do?

Reintroduces CSS classes that are necessary for `MergeRequestWidget` to show correct divs.

## 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~~
  - [x] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [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 it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

Closes #25055

See merge request !7808

app/views/projects/merge_requests/widget/_heading.html.haml

 - if @pipeline
   .mr-widget-heading
     - %w[success success_with_warnings skipped canceled failed running pending].each do |status|
-      .ci_widget{ class: "ci-status-icon-#{status}", style: ("display:none" unless @pipeline.status == status) }
+      .ci_widget{ class: "ci-#{status} ci-status-icon-#{status}", style: ("display:none" unless @pipeline.status == status) }
         = ci_icon_for_status(status)
         %span
           Pipeline

changelogs/unreleased/25055-pipelines-info-missing-from-mr-widget.yml

+---
+title: Fix pipelines info being hidden in merge request widget
+merge_request: 7808
+author: