Improve error message when trying to fork a project into a group with insufficient permissions
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Summary
In the issue Cannot fork into a group where a user has Developer permissions, it was clarified that we changed the behavior of fork functionality on purpose, and from now on, a user cannot fork project into a group in which this user has Developer permissions. At least Maintainer permissions are required for that.
Steps to reproduce
Same as in the issue #413440 (closed).
What is the current bug behavior?
The error message shown when trying to fork is not clear: An error occurred while forking the project. Please try again..
What is the expected correct behavior?
We need to show a proper and useful error message for such cases. We have a better error in the browser console: is not allowed to import projects, but it's still not perfect.
It would be great if we can say something like: You are not allowed to fork a project into this group because of insufficient permissions. See doc-page for details.
Relevant logs and/or screenshots
The errors are quoted above.