The "Failed to create GitHub repository. Not Found" error is not informative when a GitHub Personal Access Token without the repo scope is authorized in the Hub

Steps to reproduce:

1. Open the Hub
2. Click the "New project" button
3. Select "Github" for Source control provider
4. Click the "Get a token" button
5. Uncheck the "repo" scope
6. Generate token
7. Authorize the token in the Hub's Personal Access Token field
8. Create the project
9. Observe the error thrown in the Hub

Actual results: "Failed to create GitHub repository. Not Found" error is thrown

Expected results: The error should state that the token does not have sufficient permissions

Reproducible with versions: 3.17.2

Tested on (OS): MacOS Silicon Tahoe 26.3