Feature/pdct 1402 validate collection exists before creating family

[annaCPR]

Description

• validate that all collections listed referenced in the families exist in the ingest json
• refactor the entity relationships validation logic to remove duplication

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• any additional relevant motivation and context
• details of any dependency updates that are required for this change

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Type of change

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• Remove legacy code
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How Has This Been Tested?

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Reviewer Checklist

• DB_CLIENT DEPENDENCY IS ON THE LATEST VERSION
• The PR represents a single feature (small drive-by fixes are also ok)
• The PR includes tests that are sufficient for the level of risk
• The code is sufficiently commented, particularly in hard-to-understand areas
• Any required documentation updates have been made
• Any TODOs added are captured in future tickets
• No FIXMEs remain

[linear]

PDCT-1402 Validate collection exists before creating family

[odrakes-cpr]

lgtm