[BUG]: Online Restore graphql API has no interface to get status

[darkn3rd]

What version of Dgraph are you using?

v23.1.0

Tell us a little more about your go-environment?

Dgraph Docker Image

Have you tried reproducing the issue with the latest release?

Yes

What is the hardware spec (RAM, CPU, OS)?

n/a

What steps will reproduce the bug?

1. Deploy Dgraph

   helm install dg dgraph/dgraph \
     --namespace dgraph \
     --create-namespace \
     --values -  <<EOF
   fullnameOverride: dgraph
   image:
     tag: v23.1.0
   zero:
     persistence:
       storageClass: $DGRAPH_STORAGE_CLASS
   alpha:
     persistence:
       storageClass: $DGRAPH_STORAGE_CLASS
     configFile:
       config.yaml: |
         security:
           whitelist: ${MY_CIDR}
   EOF

2. Perform an online restore

   curl http://localhost:8080/admin --silent --request POST \
      --header "Content-Type: application/graphql" \
      --data "mutation 
   { 
     restore(input: { location: \"s3:\/\/\/$BUCKET_NAME/$BUCKET_PATH/\" }) 
     { message code } 
   }" | jq

Expected behavior and actual result.

The result from the API is just a job was submitted. However, there's no way to follow up and find out when that job is finished, as it is not apart of the API.

Additional information

No response