Fix SmallRye Health configuration conversion

The SmallRye Health extension needs to take the Quarkus configuration
(`quarkus.smallrye-health.*`) and convert some of it to SmallRye Health
specific configuration properties (`io.smallrye.health.*`). To do that,
the extension used to produce a `SystemPropertyBuildItem`, which results
in changing JVM-global system properties. This may negatively affect
`QuarkusUnitTest` tests, because even though each runs their own Quarkus
application, they all share the same JVM.

With this commit, the extension instead uses `RunTimeConfigurationDefaultBuildItem`,
which is properly scoped per application and doesn't affect JVM-global state.

extensions/smallrye-health/deployment/src/main/java/io/quarkus/smallrye/health/deployment/SmallRyeHealthProcessor.java

@@ -42,9 +42,9 @@
 import io.quarkus.deployment.builditem.FeatureBuildItem;
 import io.quarkus.deployment.builditem.HotDeploymentWatchedFileBuildItem;
 import io.quarkus.deployment.builditem.LaunchModeBuildItem;
+import io.quarkus.deployment.builditem.RunTimeConfigurationDefaultBuildItem;
 import io.quarkus.deployment.builditem.ShutdownContextBuildItem;
 import io.quarkus.deployment.builditem.ShutdownListenerBuildItem;
-import io.quarkus.deployment.builditem.SystemPropertyBuildItem;
 import io.quarkus.deployment.util.ServiceUtil;
 import io.quarkus.kubernetes.spi.KubernetesHealthLivenessPathBuildItem;
 import io.quarkus.kubernetes.spi.KubernetesHealthReadinessPathBuildItem;
@@ -271,11 +271,11 @@ public void defineHealthRoutes(BuildProducer<RouteBuildItem> routes,
 
     @BuildStep
     public void processSmallRyeHealthConfigValues(SmallRyeHealthConfig healthConfig,
-            BuildProducer<SystemPropertyBuildItem> systemProperties) {
+            BuildProducer<RunTimeConfigurationDefaultBuildItem> config) {
         if (healthConfig.contextPropagation) {
-            systemProperties.produce(new SystemPropertyBuildItem("io.smallrye.health.context.propagation", "true"));
+            config.produce(new RunTimeConfigurationDefaultBuildItem("io.smallrye.health.context.propagation", "true"));
         }
-        systemProperties.produce(new SystemPropertyBuildItem("io.smallrye.health.delayChecksInitializations", "true"));
+        config.produce(new RunTimeConfigurationDefaultBuildItem("io.smallrye.health.delayChecksInitializations", "true"));
     }
 
     @BuildStep(onlyIf = OpenAPIIncluded.class)