Auto merge of #81825 - voidc:pidfd, r=joshtriplett
Add Linux-specific pidfd process extensions (take 2) Continuation of #77168. I addressed the following concerns from the original PR: - make `CommandExt` and `ChildExt` sealed traits - wrap file descriptors in `PidFd` struct representing ownership over the fd - add `take_pidfd` to take the fd out of `Child` - close fd when dropped Tracking Issue: #82971
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