feat: cleanup the mutex use.

[boris-smidt-klarrio]

refactor: the condition on when the task runner finishes.
refactor: use the insert boolean instead of a !contains
feature: infinitive loop detection

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[jdx]

it would be ideal if we could have some e2e tests but I also realize that might be very difficult with this sort of change

[boris-smidt-klarrio]

I can add a the case of pr #4539
I'm not sure if i can really make a test for it since it catches the post_depends issue.

[boris-smidt-klarrio]

@jdx could we get this one merged to avoid people having to wait forever in there github actions?

[boris-smidt-klarrio]

Thank you 👍