OpenSSF Scorecard report viewer does not handle nested gitlab groups correctly

[stexandev]

Attention: this is not a duplicate of #511

Describe the bug

When trying to display the result of a scan for a gitlab repository that uses multi-level groups, the result can not be retrieved because the current implementation (split on "/") only respects the first three parts of the URL.

Reproduction steps
Steps to reproduce the behavior:

1. Load a result for a repo with multi-level groups into the viewer, e.g. `/index.html?uri=gitlab.gwdg.de%2Fsubugoe%2Femo%2Ftido
2. The result the viewer tries to fetch then is for gitlab.gwdg.de/subugoe/emo

Expected behavior

It is exspected that the viewer can handle multi-level groups and shows the results for such repos.

Additional context
Add any other context about the problem here.

[spencerschrock]

Attention: this is not a duplicate of #511

I agree it's a separate issue in the sense that it should try to fetch the correct repo, but ultimately it's blocked on #511.