rover subgraph publish should return a stdout response

[gocamille]

Description

When a user enters the rover subgraph publish command, the user should receive confirmation of a successful or failed publish via stdout or stderr respectively.

Steps to reproduce

• As a user follow the steps to publish a subgraph.

Expected result

• A successful publish should return a success message to stdout.

Actual result

• No confirmation of success is printed to stdout.

Environment

This occurs for all environments.