precompileplkgs: release parallel limiter when waiting for another process #56844
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This prevents a process waiting for a pidlock if another process is working on that thing, if this process can do other things.
Should help resource constrained workers sharing a depot, however if those workers aren't properly CPU constrained then this could exacerbate oversubscribing the system.
Here both of these have 7 (
CPU_THREADS+1
) tasks actually precompiling