`forbidden_projects` to exclude being applied to the listed projects
We have forbidden_labels
to exclude labels we're looking at, we may as well add forbidden_projects
to exclude projects we're looking at. This can be useful for group level triaging.
We're doing it in policies/groups/gitlab-org/charts/default-labels.yml and can be a useful feature, where we can use for gitlab-org/quality/triage-ops!617 (merged) as well.