Use events API to eager send attestations #24907

Job	Run time
check-msrv	5m 1s
Check for 'skip-ci' label	3s
target-branch-check	3s
lockbud	41s
check-code	12m 45s
op-pool-tests	6m 50s
network-tests	10m 32s
beacon-chain-tests	13m 33s
debug-tests-ubuntu	4m 24s
release-tests-ubuntu	14m 2s
execution-engine-integration-ubuntu	7m 56s
fallback-simulator-ubuntu	11m 22s
http-api-tests	19m 58s
cargo-udeps	7m 16s
state-transition-vectors-ubuntu	2m 43s
compile-with-beta-compiler	14m 1s
cli-check	6m 28s
basic-simulator-ubuntu	13m 23s
cargo-sort	33s
slasher-tests	1m 17s
ef-tests-ubuntu	7m 9s
test-suite-success	7s
	2h 40m 7s

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