Allow to cancel all parallel jobs
Proposal
Add the ability to cancel parallel/matrix jobs all at once.
Currently it is not possible to cancel all parallel jobs at once in the pipeline overview. Clicking on a parallel jobs gives a large list with all jobs, those can cancelled individually in the list but doing so for all jobs is like a tedious game of Whac-A-Mole, as when you just slightly miss the button you actually click on the job and the page changes to the job details. Additionally it is easy to loose track which jobs are already cancelled so it easily happens that a job is restarted by accident.
It would be great to have a cancel button for all jobs in the pop-up job list.