[Improvement]: Better error message when project is not found in gateway

[jonaro00]

Describe the improvement

To improve the error message "project not found" to something like "project 'blablah' not found", it needs a little refactor.
Start with turning ProjectNotFound into a tuple struct ProjectNotFound(ProjectName).

Then, go through all usages of this variant, and add the project name into it:

• In ScopedUser extractor, its local variable is called scope.
• The 3 usages of ProjectNotFound in gateway's proxy.rs can be handled like this:
  • 1st one: Replace with BadHost
  • 2nd one: Replace with InvalidProjectName
  • 3rd one: Replace with CustomDomainNotFound
• The rest should be straight forward.

After this change, calling cargo r -p cargo-shuttle -- project status --name unusedprojectname against the local stack should give the project name back in the error.

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Feel free to comment on this issue if you want to work on it!

[selectiveduplicate]

Hi! I'd like to work on this one if that's okay.

[orhun]

Sure, go ahead @selectiveduplicate!