Fix danger for forks

Niklas van Schrickrequested to merge
gitlab-community/gitlab-org/api/client-go:fix-danger-for-forks into main

Forks can't access vault, so they should fall back to using Danger from CI variables.

Autolabels is also getting limited to the upstream project since forks will never have a token with write access.

Also noticed some duplicate includes, so they are dropped in a separate commit as well.

Edited by Niklas van Schrick

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