Remove E from validator_client types where it's not required #19437

Job	Run time
Check for 'skip-ci' label	1s
check-code	9m 44s
check-msrv	5m 15s
lockbud	9m 32s
target-branch-check	1s
release-tests-windows	9m 23s
debug-tests-ubuntu	2m 10s
op-pool-tests	9m 34s
network-tests	9m 38s
beacon-chain-tests	9m 36s
release-tests-ubuntu	9m 37s
slasher-tests	1m 52s
state-transition-vectors-ubuntu	2m 28s
basic-simulator-ubuntu	9m 33s
cargo-udeps	9m 28s
cli-check	8m 1s
compile-with-beta-compiler	9m 32s
ef-tests-ubuntu	9m 35s
execution-engine-integration-ubuntu	8m 55s
fallback-simulator-ubuntu	9m 31s
test-suite-success	1s
	2h 23m 27s

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