Add missing default value for client-provider-type property

Closes gh-41666

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/resources/META-INF/additional-spring-configuration-metadata.json

@@ -2073,6 +2073,10 @@
         "level": "error"
       }
     },
+    {
+      "name": "management.newrelic.metrics.export.client-provider-type",
+      "defaultValue": "insights-api"
+    },
     {
       "name": "management.observations.annotations.enabled",
       "type": "java.lang.Boolean",