Remove E from validator_client types where it's not required #19456

Job	Run time
check-code	19s
Check for 'skip-ci' label	3s
check-msrv	5s
lockbud	35s
target-branch-check	1s
op-pool-tests	17s
release-tests-ubuntu	26s
beacon-chain-tests	9s
release-tests-windows	15s
debug-tests-ubuntu	11s
slasher-tests	27s
cargo-udeps	16s
basic-simulator-ubuntu	24s
ef-tests-ubuntu	41s
execution-engine-integration-ubuntu	11s
network-tests	27s
fallback-simulator-ubuntu	17s
state-transition-vectors-ubuntu	18s
cargo-sort	43s
cli-check	14s
compile-with-beta-compiler	28s
test-suite-success	0s
	6m 47s

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