precompile: fix a myriad of concurrency and cache handling mistakes #59670
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* The LOADING_CACHE PR failed to acquire the lock in many places it was new made mandatory. * The stale_cache_key did not include many relevant parameters. * The `isprecompiled` implementation failed to account for the preferred stdlib logic of loading. * The `isprecompiled` cache failed to account for either newly compiled packages or other changes to the file system. * After parallel precompile noticed a package fails, it would retry with serial precompile, which was very pointless. * Semaphore could be <= 0, leading to deadlock.
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isprecompiledimplementation failed to account for the preferred stdlib logic of loading.isprecompiledcache failed to account for either newly compiled packages or other changes to the file system.Marked as draft since this is against the quieter-logging PR (#59652).