Address Mark's review comments on single-pass #15591

Job	Run time
check-code	10m 22s
cargo-udeps	6m 25s
beacon-chain-tests	18m 21s
check-msrv	4m 11s
cli-check	18m 36s
compile-with-beta-compiler	13m 7s
debug-tests-ubuntu	14m 30s
dockerfile-ubuntu	13m 28s
doppelganger-protection-test	22m 27s
eth1-simulator-ubuntu	28m 54s
ef-tests-ubuntu	14m 38s
execution-engine-integration-ubuntu	14m 11s
merge-transition-ubuntu	29m 0s
network-tests	15m 59s
no-eth1-simulator-ubuntu	26m 44s
op-pool-tests	19m 33s
release-tests-ubuntu	21m 53s
release-tests-windows	24m 35s
slasher-tests	5m 28s
state-transition-vectors-ubuntu	10m 35s
syncing-simulator-ubuntu	21m 11s
target-branch-check	1s
test-suite-success	0s
	5h 54m 9s

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