Lists the projects associated with a billing account. The current authenticated user must have
the `billing.resourceAssociations.list` IAM permission, which is often given to billing account
[viewers](https://cloud.google.com/billing/docs/how-to/billing-access).
Create a request for the method "projects.list".
This request holds the parameters needed by the cloudbilling server. After setting any optional
parameters, call the
AbstractGoogleClientRequest.execute()
method to invoke the remote operation.