Rollup merge of #113939 - the8472:pidfd-from-child, r=Mark-Simulacrum
open pidfd in child process and send to the parent via SOCK_SEQPACKET+CMSG This avoids using `clone3` when a pidfd is requested while still getting it in a 100% race-free manner by passing it up from the child process. This should solve most concerns in #82971
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