evals for max-disconnect-timeout escape GC

[tgross]

While testing #18701 I ran into a weird bug in evaluation GC for evaluations created for max-disconnect-timeout. After purging a job and running nomad system gc, I expect to find no more evaluations for the job. But the evaluation for max-disconnect-timeout still exists:

$ nomad eval list
ID        Priority  Triggered By            Job ID  Namespace  Node ID  Status   Placement Failures
ba6f9a5d  50        max-disconnect-timeout  httpd   default    <none>   pending  false

[lgfa29]

I think this is a dup of #12809.

(It seems like it's a yearly tradition for us to bump into this problem 😅)

[tgross]

Oops, thanks!

[github-actions]

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