Use events API to eager send attestations #24906

Job	Run time
target-branch-check	2s
Check for 'skip-ci' label	3s
check-msrv	5m 10s
lockbud	45s
check-code	12m 24s
beacon-chain-tests	14m 11s
network-tests	15m 48s
http-api-tests	21m 39s
state-transition-vectors-ubuntu	6m 48s
op-pool-tests	11m 14s
debug-tests-ubuntu	5m 28s
slasher-tests	3m 3s
ef-tests-ubuntu	8m 22s
fallback-simulator-ubuntu	18m 12s
basic-simulator-ubuntu	20m 35s
release-tests-ubuntu	16m 18s
cargo-udeps	7m 37s
cli-check	13m 33s
compile-with-beta-compiler	13m 42s
execution-engine-integration-ubuntu	7m 57s
cargo-sort	9s
test-suite-success	6s
	3h 23m 6s

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