Remove E from validator_client types where it's not required #19441

Job	Run time
target-branch-check	1s
Check for 'skip-ci' label	1s
check-code	13m 14s
check-msrv	5m 18s
lockbud	14m 1s
op-pool-tests	15m 52s
release-tests-windows	29m 47s
debug-tests-ubuntu	6m 16s
beacon-chain-tests	16m 47s
release-tests-ubuntu	24m 34s
network-tests	18m 36s
slasher-tests	2m 1s
state-transition-vectors-ubuntu	2m 11s
basic-simulator-ubuntu	13m 21s
cargo-udeps	7m 28s
cli-check	8m 4s
compile-with-beta-compiler	14m 51s
ef-tests-ubuntu	13m 24s
execution-engine-integration-ubuntu	8m 26s
fallback-simulator-ubuntu	11m 10s
test-suite-success	3s
	3h 45m 26s

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