Added missing button variant to erase job log modal

What does this MR do and why?

This MR will solve: #344145 (closed)

It adds the variant="danger" to the confirm button on the job log controller delete modal.

Screenshots or screen recordings

header

How to set up and validate locally

1. go to a project which has had some jobs running
2. go to /GROUP/PROJECT/-/jobs/$JOBID
3. click the delete icon on the log page, the modal opens up Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.