User is not warned when deleting a job or job definition in List view

[andrii-i]

Description

When the user clicks "X" to delete Job or delete Job Definition from the List view, the job or job definition is deleted immediately, with no confirmation step. This is irreversible.

Expected behavior

"single button that is two-stage delete. The first click on the "X" would turn that button into a more prominent (and red) delete button, which when clicked would actually delete the job. iOS does this in places and it is a bit more lightweight than a full dialog, which would get cumbersome for in situations where you are deleting jobs often, but not using (the yet to be built) multi-selection batch actions." - by @ellisonbg in #107