Add information about which required field was missing #2316

Job	Run time
conformance	1m 54s
build (2_12, e2e)	1m 53s
build (2_12, test)	1m 54s
build (2_13, e2e)	1m 37s
build (2_13, test)	1m 53s
build (3, e2e)	1m 51s
build (3, test)	1m 52s
build (2_12, examples_and_formatting)	1m 52s
build (2_13, scala3_compat_test)	1m 53s
build (3, scala3_compat_test)	1m 53s
ci-passed	0s
	18m 32s

Provide feedback