Convert delayed job modals to GitLab native modals

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Problem

A decision was made to reduce scope of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/21767 and implement the modals as browser native to start off with.

Solution

Convert to GitLab native modals:

Run JOBNAME?

Are you sure you want to run JOBNAME immediately? This job will run automatically after it's timer (00:00:00) finishes.

Button (default grey) Cancel
Button (default grey) Run job immediately