Add MR links to Pipeline view

Problem to solve

When I check for pipeline results in pipeline view there is no link to related MRs on the page. It's not easy to find a MR this pipeline was triggered for.

Target audience

All pipeline users.

Further details

Example page: https://gitlab.com/gitlab-org/gitlab-ce/pipelines/48689904

Proposal

• Add a separate related merge request info line in the widget on the pipeline view.
• It includes merge request information similar to the commit view widget
• It is only shown for branch pipelines (not merge request pipelines either attached or detached)

If no related merge requests are found:

• No related merge requests found

If a single merge request is found:

• 1 related merge request: !1 Merge request title

If multiple merge requests are found:

• 2 related merge requests: !2 Merge request title, !1 Merge request title

Note: Merge request titles should not be italicized. This is a small error in the mockups.

Documentation

What does success look like, and how can we measure that?

User takes one click less to get to MR page from pipeline view page.

AC1:

• Given Pipeline 1 was triggered for a commit in MR "A" and in MR "B"
• When I'm on Pipeline 1 view page
• Then I should see a link to MR "A"
• Then I should see a link to MR "B"

Links / references