dashboard: Add link to retrigger failed pipelines

GitLab makes retrying failed jobs easy, but sometimes it's preferable to retrigger the whole pipeline from scratch for consistency, so let's make it more convenient by adding a dedicated button to each failure report.

added 3 commits

• 5802aad0...17ca61a5 - 2 commits from branch master
• 9621ac2a - dashboard: Add link to retrigger failed pipelines

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requested review from @vignesh

approved this merge request

merged