[Java] Replace `if` with `?` in Generated `toIndentedString`-methods #928

Job	Run time
Build Java Client JDK17 (samples/client/others/java/webclient-sealedInterface)	1m 47s
Build Java Client JDK17 (samples/client/others/java/restclient-enum-in-multipart)	1m 38s
Build Java Client JDK17 (samples/client/petstore/java/restclient)	2m 17s
Build Java Client JDK17 (samples/client/petstore/java/resttemplate-springBoot4-jackson3)	1m 45s
Build Java Client JDK17 (samples/client/petstore/java/webclient-jakarta)	1m 46s
Build Java Client JDK17 (samples/client/petstore/java/resttemplate-jakarta)	1m 55s
Build Java Client JDK17 (samples/client/others/java/webclient-sealedInterface_3_1)	2m 29s
Build Java Client JDK17 (samples/client/petstore/java/webclient-springBoot4-jackson3)	1m 46s
Build Java Client JDK17 (samples/client/petstore/java/restclient-useSingleRequestParameter-static)	2m 23s
Build Java Client JDK17 (samples/client/petstore/java/resttemplate-springBoot4-jackson2)	1m 55s
Build Java Client JDK17 (samples/client/petstore/java/restclient-springBoot4-jackson2)	3m 4s
Build Java Client JDK17 (samples/client/petstore/java/webclient-useSingleRequestParameter)	1m 54s
Build Java Client JDK17 (samples/client/petstore/java/restclient-useSingleRequestParameter)	2m 15s
Build Java Client JDK17 (samples/client/petstore/java/restclient-swagger2)	2m 18s
Build Java Client JDK17 (samples/client/petstore/java/restclient-nullable-arrays)	1m 47s
Build Java Client JDK17 (samples/client/petstore/java/restclient-springBoot4-jackson3)	2m 45s
	33m 44s

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