Denorms the 1st checkout date to the asset table

[Godmartinz]

This removes the addSelect from the asset index and denormalizes the field to the assets table with a DB update in a migration.

another migration is created before the backfill of the first_checkout_at date, to index the action_log by [item_type, item_id, action_type, created_at] to make the whole matching process quicker.

[snipe]

@uberbrady Please look at this one carefully when you get a moment. Folks with a lot of action logs could run into issues here.

[uberbrady]

Thanks for taking a swing at this! I think it's a good start, but I'd like to see a few things change, if we can. Let's hop together on the pairing channel to see if we can get this across the finish line. Some very sophisticated query logic in here; I'm impressed :)

[codacy-production]

Up to standards ✅

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🟢 Metrics 5 complexity

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Complexity	5

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