Fix/remove some Electra attestation todos #16743

Job	Run time
op-pool-tests	19m 27s
network-tests	14m 29s
beacon-chain-tests	2m 52s
release-tests-ubuntu	23m 45s
release-tests-windows	44m 59s
slasher-tests	3m 12s
target-branch-check	1s
basic-simulator-ubuntu	19m 49s
cargo-udeps	6m 18s
check-msrv	4m 13s
cli-check	15m 55s
compile-with-beta-compiler	13m 4s
check-code	7m 52s
debug-tests-ubuntu	9m 5s
dockerfile-ubuntu	14m 4s
doppelganger-protection-test	18m 44s
ef-tests-ubuntu	14m 4s
fallback-simulator-ubuntu	17m 44s
execution-engine-integration-ubuntu	15m 34s
state-transition-vectors-ubuntu	9m 10s
test-suite-success	0s
	4h 34m 21s

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