JUnit XML CI View: Display Last Instance Test Failed

Background

This JUnit XML epic &187 (closed) contains the priority of iterations for the MR widget and CI view.

Proposal

• When a test fails we show the first job this test failed at (without a success following it) and a direct link to that job. This will help users see which commit might be responsible for the failed unit test. Some of the interest for this feature has been discussed in the comment section here: https://gitlab.com/gitlab-org/gitlab-ce/issues/17081. It doesn't show the full build history for each test (although we should consider how we could iterate to this in the future if needed) but the immediate need to see when the test started to fail is important.