Move whitelists in data/whitelists.yaml

Both scripts packaging-updates and packaging-check-invariants contain quite long lists of packages to ignore. This makes both scripts and lists a bit difficult to read. Instead move the lists into a specific file at data/whitelists.yaml. This should make maintenance easier.

The generated dashboard generated from this MR looks fine (no regression, nor changes).

Maybe calling them ignorelist instead of whitelist would be more accurate? 🤔