Refactor NON_DATASET_PACKAGE approach to support packages

[Mikaayenson]

Summary

In #3430 we spent time sanity checking additions to NON_DATASET_PACKAGE. We currently have to double check several things, indicating potential opportunities to refactor.

We may want to rely on the index pattern to parse this information. We should also create a checklist if needed for future PRs.

[botelastic]

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