Use ValidatorPublicKey instead of ValidatorName #12203

Job	Run time
execution-wasmtime-test	1m 14s
benchmark-test	7m 53s
default-features-and-witty-integration-test	32m 55s
check-outdated-cli-md	1m 43s
ethereum-tests	8m 34s
lint-unexpected-chain-load-operations	3s
remote-net-test	18m 55s
storage-service-tests	24m 3s
wasm-application-test	10m 34s
web	4m 45s
lint-cargo-clippy	12m 39s
lint-cargo-doc	5m 0s
lint-cargo-fmt	49s
lint-cargo-machete	23s
lint-cargo-sort	23s
lint-check-all-features	24m 3s
lint-check-copyright-headers	16s
lint-check-for-outdated-readme	1m 4s
lint-check-linera-service-graphql-schema	1m 12s
lint-wasm-applications	3m 47s
	2h 40m 15s

Provide feedback