Add job log mixins for the job log page
What does this MR do?
It's the backport of the mixins utilized here: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/6111
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary - Conform by the code review guidelines
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Has been reviewed by a Frontend maintainer
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Conform by the merge request performance guides -
Conform by the style guides -
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