Use events API to eager send attestations #17867

Job	Run time
dockerfile-ubuntu	8m 27s
run-local-testnet	27m 18s
doppelganger-protection-failure-test	7m 4s
genesis-sync-test-fulu-120s	4m 20s
doppelganger-protection-success-test	12m 14s
genesis-sync-test-electra-300s	7m 19s
genesis-sync-test-electra-120s	4m 32s
genesis-sync-test-fulu-300s	7m 41s
checkpoint-sync-test-${{ matrix.network }}	0s
local-testnet-success	10s
	1h 19m 5s

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