GitHub project import: Clarify error messages
What does this MR do and why?
Changes the error message that is displayed while attempting to import a new project and authenticating with GitHub.
When the wrong Personal Access Token is entered, the error now says "Wrong credentials"
References
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MR acceptance checklist
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Screenshots or screen recordings
Screenshots are required for UI changes, and strongly recommended for all other merge requests.
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How to set up and validate locally
Numbered steps to set up and validate the change are strongly suggested.
- Navigate to http://127.0.0.1:3000/import/github/new
- Type in a nonsense string as the personal access token
- Click the authenticate button. You should see the validation error
Related to #515820 (closed)

