improve libp2p connected peer metrics #15469

Job	Run time
beacon-chain-tests	20m 11s
cargo-udeps	6m 46s
check-code	11m 15s
check-msrv	4m 23s
cli-check	19m 14s
compile-with-beta-compiler	13m 59s
debug-tests-ubuntu	17m 28s
dockerfile-ubuntu	13m 46s
doppelganger-protection-test	25m 44s
ef-tests-ubuntu	16m 5s
eth1-simulator-ubuntu	23m 39s
execution-engine-integration-ubuntu	15m 55s
merge-transition-ubuntu	23m 36s
network-tests	14m 4s
no-eth1-simulator-ubuntu	22m 39s
op-pool-tests	16m 57s
release-tests-ubuntu	18m 18s
release-tests-windows	33m 6s
slasher-tests	5m 56s
state-transition-vectors-ubuntu	8m 21s
syncing-simulator-ubuntu	16m 4s
target-branch-check	1s
test-suite-success	9s
	5h 47m 36s

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