Update additional-spring-configuration-metadata to contain missing ma… (

#543)

* Update additional-spring-configuration-metadata to contain missing management.health.pubsub configuration

This change adds the missing management endpoint found in the [documentation](https://googlecloudplatform.github.io/spring-cloud-gcp/2.0.3/reference/html/index.html#cloud-pubsub-health-indicator) to the metadata. This will allow IntelliJ to provide proper tooltips and recognize the property by users. 

Fixes: #524.

Co-authored-by: Mike Eltsufin <meltsufin@google.com>

spring-cloud-gcp-autoconfigure/src/main/resources/META-INF/additional-spring-configuration-metadata.json

@@ -119,7 +119,12 @@
       "type": "java.lang.Boolean",
       "description": "Auto-configure Google Cloud Core components.",
       "defaultValue": true
+    },
+    {
+      "name": "management.health.pubsub.enabled",
+      "type": "java.lang.Boolean",
+      "description": "Whether to enable the Pub/Sub health indicator when used with Spring Boot Actuator.",
+      "defaultValue": true
     }
   ]
 }
-