Remove lighthouse_network dependency from eth2 crate #19321

Job	Run time
lockbud	14m 19s
check-code	9m 34s
Check for 'skip-ci' label	1s
check-msrv	5m 18s
target-branch-check	1s
beacon-chain-tests	25m 19s
release-tests-ubuntu	11m 16s
debug-tests-ubuntu	5m 39s
network-tests	20m 23s
op-pool-tests	15m 7s
release-tests-windows	14m 57s
slasher-tests	1m 34s
state-transition-vectors-ubuntu	2m 6s
cargo-udeps	7m 11s
cli-check	9m 20s
basic-simulator-ubuntu	16m 31s
compile-with-beta-compiler	14m 20s
ef-tests-ubuntu	13m 23s
execution-engine-integration-ubuntu	14m 14s
fallback-simulator-ubuntu	14m 37s
test-suite-success	0s
	3h 35m 10s

Provide feedback