Add Integration tests for all parts of the wasmer deploy + publish flow

[syrusakbary]

We should have integration tests testing the new behaviors.

Things to test:

• Non-interactive mode
  • Unnamed package
    • Deploy a new app with an unnamed package
    • Try to deploy the same app again but with changed contents (should publish a new package release)
  • Named package
    • Pass the --bump flag when deploying app without changing content
    • Deploy app after changing content
  • Deploy app from an empty directory (should fail)
  • Deploy app without owner field
    • pass in the --owner flag (should pass)
    • do not pass in the --owner flag (should fail)
  • Deploy app without name
    • pass the --nameflag (should pass)
    • do not pass the --name flag (should fail)