procnet: replace iptables PREROUTING DNAT with userspace forwarder #18541

Job	Run time
check-paths / check	11s
package (linux, ubuntu-22.04)	6m 10s
package (mac, aarch64, macos-latest)	5m 42s
package (win, windows-latest)	20m 35s
package (mac, x86_64, macos-15-intel)	17m 48s
Test Signing (Windows)	0s
Test Signing (macOS)	0s
	50m 26s

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