Duplicate results with google.compute.instance.IdleResourceRecommender filter for gcp.instance

[iamanmolm]

On running custodian:
`policies:

• name: gcp-idle-compute-vm
  resource: gcp.instance
  filters:
  • type: recommend
    id: google.compute.instance.IdleResourceRecommender`
    We are getting duplicate results with above policy.

[iamanmolm]

Created a bug type issue: #9684 and raised a fix for this.