When failing to push a branch because of branch sharing permissions, the error message is too generic to be helpful

[Steve Dodier-Lazaro]

*Current Situation*
When pushing, with a correct identity and key, a branch to a project which has branch sharing set to Forbidden, I receive an error message that does not help to identify the specific issue at hand:

    You cannot create branches in "~team-name/project-name"

*Expected*
An error message could be construed so that it's clear the problem is not related to the user / team, but to the project.

    Project "project-team" is configured to forbid branch sharing [from ~identity, if the sharing is forbidden only for some identities].

Thanks.