Remove manual poll of the libp2p Swarm #18915

Job	Run time
Check for 'skip-ci' label	1s
lockbud	13m 16s
check-code	9m 21s
check-msrv	5m 21s
target-branch-check	1s
release-tests-windows	41m 32s
release-tests-ubuntu	19m 48s
op-pool-tests	22m 42s
network-tests	25m 40s
beacon-chain-tests	36m 14s
debug-tests-ubuntu	10m 6s
slasher-tests	3m 48s
state-transition-vectors-ubuntu	9m 14s
basic-simulator-ubuntu	20m 54s
cargo-udeps	7m 15s
cli-check	13m 57s
compile-with-beta-compiler	13m 41s
ef-tests-ubuntu	10m 7s
execution-engine-integration-ubuntu	7m 8s
fallback-simulator-ubuntu	18m 39s
test-suite-success	4s
	4h 48m 49s

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