fix(spring): Add Nullable import for array-type models (#22788) #1000

Job	Run time
Build with JDK17 (samples/client/petstore/spring-http-interface)	52s
Build with JDK17 (samples/client/petstore/java-helidon-client/v3/se)	56s
Build with JDK17 (samples/openapi3/client/petstore/spring-cloud-3)	55s
Build with JDK17 (samples/client/petstore/java/webclient-jakarta)	50s
Build with JDK17 (samples/client/petstore/java-helidon-client/v3/mp/)	46s
Build with JDK17 (samples/client/petstore/java/microprofile-rest-client-outer-enum)	38s
Build with JDK17 (samples/client/petstore/spring-http-interface-reactive)	32s
Build with JDK17 (samples/openapi3/server/petstore/springboot-3)	45s
Build with JDK17 (samples/server/petstore/java-helidon-server/v3/mp/)	47s
Build with JDK17 (samples/server/petstore/java-camel/)	1m 5s
Build with JDK17 (samples/client/petstore/spring-http-interface-reactive-noResponseEntity)	31s
Build with JDK17 (samples/client/petstore/spring-http-interface-noResponseEntity)	33s
Build with JDK17 (samples/server/petstore/java-helidon-server/v3/se)	50s
	10m 0s

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