Fix todos in deneb code #13061

Job	Run time
extract-msrv	5s
compile-with-beta-compiler	22m 8s
cargo-fmt	11s
target-branch-check	1s
release-tests-windows	13m 55s
release-tests-ubuntu	6m 25s
beacon-chain-tests	27m 34s
dockerfile-ubuntu	26m 18s
debug-tests-ubuntu	14m 10s
ef-tests-ubuntu	14m 42s
network-tests	23m 29s
slasher-tests	6m 47s
state-transition-vectors-ubuntu	19m 55s
op-pool-tests	26m 32s
arbitrary-check	2m 14s
cargo-audit	4m 10s
cargo-udeps	14m 58s
check-benchmarks	7m 41s
check-msrv	8m 24s
clippy	8m 30s
doppelganger-protection-test	43m 52s
eth1-simulator-ubuntu	38m 30s
execution-engine-integration-ubuntu	26m 10s
merge-transition-ubuntu	41m 7s
no-eth1-simulator-ubuntu	36m 57s
syncing-simulator-ubuntu	33m 14s
	7h 47m 59s

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