convertGrpcStatus does not add grpc-status or grpc-message headers

[kevin-shelaga]

Describe the bug setting convertGrpcStatus in https://docs.solo.io/gloo-edge/latest/reference/api/github.com/solo-io/gloo/projects/gloo/api/v1/options/grpc_json/grpc_json.proto.sk/ does not add grpc-status or grpc-message headers when an error occurs. Also no error details were added the to body as json.

To Reproduce Steps to reproduce the behavior:

1. Follow advanced guide (https://docs.solo.io/gloo-edge/latest/guides/traffic_management/destination_types/grpc_to_rest_advanced/)
2. Add the following to the gateway

   ...
   httpGateway:
   options:
     grpcJsonTranscoder:
       convertGrpcStatus: true
       printOptions:
         alwaysPrintPrimitiveFields: true
         preserveProtoFieldNames: true
   ...

3. Using grpcurl send a bad request (grpcurl -v --plaintext -d '{"theme": "music"}' $URL:80 main.Bookstore.CreateShelf
4. See error

   
   Resolved method descriptor:
   rpc CreateShelf ( .main.CreateShelfRequest ) returns ( .main.Shelf ) {
   option (.google.api.http) = { post:"/shelf" body:"shelf"  };
   }

Request metadata to send: (empty) Error invoking method "main.Bookstore.CreateShelf": error getting request data: message type main.CreateShelfRequest has no known field named theme

**Expected behavior**
grpc-status and grpc-message headers should be returned

**Additional context**
Add any other context about the problem here, e.g.
- Gloo Edge version - v1.8.0
- Kubernetes version - 1.20

[github-actions[bot]]

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