Make registration of OAuthBearerValidatorCallbackHandler conditional

`org.apache.kafka.common.security.oauthbearer.OAuthBearerValidatorCallbackHandler`
depends on the optional
`org.jose4j.keys.resolvers.VerificationKeyResolver` so it should only be
registered when the latter is present, similarly to
`org.apache.kafka.common.security.oauthbearer.secured.OAuthBearerValidatorCallbackHandler`

Closes quarkusio#38851

extensions/kafka-client/deployment/src/main/java/io/quarkus/kafka/client/deployment/KafkaProcessor.java

@@ -415,6 +415,9 @@ public void withSasl(CombinedIndexBuildItem index,
         reflectiveClassCondition.produce(new ReflectiveClassConditionBuildItem(
                 "org.apache.kafka.common.security.oauthbearer.secured.OAuthBearerValidatorCallbackHandler",
                 "org.jose4j.keys.resolvers.VerificationKeyResolver"));
+        reflectiveClassCondition.produce(new ReflectiveClassConditionBuildItem(
+                "org.apache.kafka.common.security.oauthbearer.OAuthBearerValidatorCallbackHandler",
+                "org.jose4j.keys.resolvers.VerificationKeyResolver"));
     }
 
     private void registerJDKLoginModules(BuildProducer<ReflectiveClassBuildItem> reflectiveClass) {