Fix #16561 by marking required a requestBody as @NotNull if it is req… #1105

Job	Run time
Build with JDK17 (samples/server/petstore/springboot-x-implements-skip)	59s
Build with JDK17 (samples/client/petstore/spring-http-interface)	55s
Build with JDK17 (samples/openapi3/server/petstore/springboot-3-include-http-request-context)	55s
Build with JDK17 (samples/client/petstore/spring-http-interface-reactive)	54s
Build with JDK17 (samples/client/petstore/java-helidon-client/v3/mp/)	54s
Build with JDK17 (samples/client/petstore/java/webclient-jakarta)	50s
Build with JDK17 (samples/client/petstore/java-helidon-client/v3/se)	1m 4s
Build with JDK17 (samples/client/petstore/spring-http-interface-reactive-noResponseEntity)	1m 7s
Build with JDK17 (samples/openapi3/client/petstore/spring-cloud-3)	1m 2s
Build with JDK17 (samples/client/petstore/spring-http-interface-noResponseEntity)	34s
Build with JDK17 (samples/openapi3/server/petstore/springboot-3)	1m 3s
Build with JDK17 (samples/server/petstore/java-helidon-server/v3/mp/)	1m 4s
Build with JDK17 (samples/client/petstore/java/microprofile-rest-client-outer-enum)	59s
Build with JDK17 (samples/server/petstore/java-camel/)	1m 1s
Build with JDK17 (samples/server/petstore/java-helidon-server/v3/se)	52s
	14m 13s

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