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

[JasonWeill]

Description

When the user clicks "Delete Job" or "Delete Job Definition" from the details view, the job or job definition is deleted immediately, with no confirmation step. This is irreversible.

Expected behavior

The user should see a confirmation dialog (e.g., a modal) when they click a delete button so that they can confirm their decision to delete.

[ellisonbg]

Another option is to have a 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.

[andrii-i]

Created #142 to track Deletion confirmation in List View in a way described by @ellisonbg above. Renamed this issue to clarify that it tracks Deletion confirmation in Details View using modal confirmation.