[DataUsage][Serverless] Log more info on autoops 503 errors (#202350)

## Summary

Adds error info from auto ops when we see 503 errors while making a
request to autoops service.


### Checklist

Check the PR satisfies following conditions. 

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support](https://github.com/elastic/kibana/blob/main/packages/kbn-i18n/README.md)
- [ ]
[Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html)
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- [ ] [Unit or functional
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- [ ] ...

x-pack/plugins/data_usage/server/services/autoops_api.ts

@@ -123,7 +123,7 @@ export class AutoOpsAPIService {
             `${AUTO_OPS_AGENT_CREATION_PREFIX} with an error ${error} ${requestConfigDebugStatus}`,
             errorMetadataWithRequestConfig
           );
-          throw new Error(withRequestIdMessage(error.message));
+          throw new AutoOpsError(withRequestIdMessage(error.message));
         }
 
         const errorLogCodeCause = `${error.code}  ${this.convertCauseErrorsToString(error)}`;
@@ -152,14 +152,16 @@ export class AutoOpsAPIService {
             `${AUTO_OPS_AGENT_CREATION_PREFIX} while sending the request to the AutoOps API: ${errorLogCodeCause} ${requestConfigDebugStatus}`,
             errorMetadataWithRequestConfig
           );
-          throw new Error(withRequestIdMessage(`no response received from the AutoOps API`));
+          throw new AutoOpsError(withRequestIdMessage(`no response received from the AutoOps API`));
         } else {
           // Something happened in setting up the request that triggered an Error
           this.logger.error(
-            `${AUTO_OPS_AGENT_CREATION_PREFIX} to be created ${errorLogCodeCause} ${requestConfigDebugStatus}`,
+            `${AUTO_OPS_AGENT_CREATION_PREFIX} to be created ${errorLogCodeCause} ${requestConfigDebugStatus} ${error.toJSON()}`,
             errorMetadataWithRequestConfig
           );
-          throw new AutoOpsError(withRequestIdMessage(AGENT_CREATION_FAILED_ERROR));
+          throw new AutoOpsError(
+            withRequestIdMessage(`${AGENT_CREATION_FAILED_ERROR}, ${error.message}`)
+          );
         }
       }
     );