[do not merge] Ensure client and scheduler are resilient to server autoscaling#2277

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trxcllnt wants to merge 6 commits intomozilla:mainfrom trxcllnt:fea/autoscaling

+879-406

Commits on Oct 28, 2024

track started job mtimes and assume jobs that take longer than SCCACHE_DIST_REQUEST_TIMEOUT seconds are stale and should be removed
trxcllnt
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