Add check repo function

[ZiyadBoshima]

This will ensure that the user does not login to the dashboard and access a repo that does not exist.

Bug

• Related issues linked using fixes #number
• Integration tests added
• Errors have a helpful link attached, see contributing.md

Feature

• [ x] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
• Related issues linked using fixes #number
• Integration tests added
• Documentation added

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[avitorio]

Hey @ZiyadBoshima , thank you so much for this. I've made some changes to the PR. Mainly I've removed the check collaborator part, since checking the repo via the API only returns true if we are a collaborator.

I also changed how the errors are displayed, so that we can link to the docs in the error messages properly. Let me know what you think. Cheers!