Optimise Electra op pool aggregation #16537

Job	Run time
check-code	8m 5s
basic-simulator-ubuntu	13m 3s
cargo-udeps	6m 19s
beacon-chain-tests	4m 22s
check-msrv	4m 28s
cli-check	8m 54s
compile-with-beta-compiler	13m 40s
debug-tests-ubuntu	7m 48s
dockerfile-ubuntu	13m 54s
doppelganger-protection-test	22m 29s
ef-tests-ubuntu	14m 20s
execution-engine-integration-ubuntu	15m 21s
fallback-simulator-ubuntu	10m 49s
network-tests	8m 3s
op-pool-tests	12m 14s
release-tests-ubuntu	24m 59s
release-tests-windows	11m 29s
slasher-tests	1m 9s
state-transition-vectors-ubuntu	2m 22s
target-branch-check	1s
test-suite-success	0s
	3h 23m 49s

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