[Associations] Start adding `strict_loading`

[garyhtou]

https://www.bigbinary.com/blog/rails-6-1-adds-strict_loading-to-warn-lazy-loading-associations

[sampoder]

Can this ticket be scoped out? Where do we want to use this?

[garyhtou]

Strict loading is a Rails feature where when you call an association without preloading it, Rails will error to prevent an N+1. This forces us to fix/avoid N+1 issues and improve performance.

We'll start by gradually adding strict loading to commonly used associations on Event and User.

[garyhtou]

link that @sampoder found: https://jordanhollinger.com/2023/11/11/rails-strict-loading/

[YodaLightsabr]

I think a good approach to this would be

1. Setting config.active_record.action_on_strict_loading_violation = :log
2. Working model-by-model to add self.strict_loading_by_default = true
3. Temporarily setting config.active_record.action_on_strict_loading_violation = :raise
4. Fixing all instances in that model
5. Making a PR that fixes N+1 issues and adds strict loading by default to that model (to keep it in place going forward)