Auto merge of #140177 - tmandry:compiletest-par, r=jieyouxu

[compiletest] Parallelize test discovery

Certain filesystems are slow to service individual read requests, but can service many in parallel. This change brings down the time to run a single cached test on one of those filesystems from 40s to about 8s.
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bors 2025-04-26 02:03:54 +00:00
commit f0ef8ea058

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