PROTO-1767: rm old reactions columns and modify indexers to not use it

[alecsavvy]

Description

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide repro instructions & any configuration.

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Latest commit: 0bf64f0

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[rickyrombo]

Do we want to add the ACDC block for going forward? eg to help with reverts maybe w/ cascade delete?

[gitguardian]

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🔎 Detected hardcoded secrets in your pull request

GitGuardian id	GitGuardian status	Secret	Commit	Filename
9349019	Triggered	Generic High Entropy Secret	be88ee8	dev-tools/config.json	View secret
9349019	Triggered	Generic High Entropy Secret	11d9f9c	packages/ddex/.env.stage	View secret

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