[net/libp2p] Use raw `Identify` observed addresses to discover external addresses #11563

Job	Run time
preflight / preflight	48s
preflight / ci-versions	57s
build-runtimes-polkavm	6m 58s
build-subkey	3m 56s
check-revive-stable-uapi-polkavm	2m 9s
All build misc jobs passed	1s
	14m 49s

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