If a 4xx server response lists scopes in the X-Accepted-Oauth-Scopes
header that are not present in the X-Oauth-Scopes header, the final
error messaging on stderr will now include a hint for the user that they
might need to request the additional scope:
$ gh codespace list
error getting codespaces: HTTP 403: Must have admin rights to Repository. (https://api.github.com/user/codespaces?per_page=30)
This API operation needs the "codespace" scope. To request it, run: gh auth refresh -h github.com -s codespace
This enforces strict separation between serialization structs used for
repository creation payload with respect to whether GraphQL or REST was
used. Before, a field added to a GraphQL payload would leak to REST
payload (and vice versa).
