Fix collapsing sections in job log viewer

What does this MR do and why?

This fixes sections of the log that have been indicated as "collapsed" by the job log that didn't collapse correctly.

This issue was reported at #454817 (comment 1898909769)

MR acceptance checklist

Screenshots or screen recordings

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How to set up and validate locally

I wanted to test this with a real log, to I downloaded one and patched it in to see the logs. You can see the validation commit at: !152637 (closed).

Open any valid job page and add /viewer to see the Installing gems section collapse correctly.

Related to #454817