Add validation for a few string fields #6682

Job	Run time
build-docker-image / build-image	5m 35s
feature-tests-java / test	2m 26s
feature-tests-python / test	1m 41s
feature-tests-go / test	2m 36s
feature-tests-dotnet / test	1m 1s
feature-tests-ts / test	2m 14s
	15m 33s

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