Schema check for whitelists repo

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Description

https://repo1.dsop.io/dsop/dccscr-whitelists

Especially as we migrate to hardening_manifest, we have a lot of cleanup to do in the whitelists repo.

We need to add a pipeline to the repository to:

• Validate the format of greylists with json schema
• Prettier to pretty print json

Purpose

Plan

• Decide on what fields are allowed, in use, etc.

Possible Blockers/Challenges

Acceptance Criteria