xDBActions should have validation be optional

[amilner42]

We often use it internally, validation is only needed when we get data from the user.

[amilner42]

Refer to qa.model.ts once it's merged to see how I handle optional validation.

Once we switch everything to optional validation, make sure every time we call the function internally (and not from a route endpoint) that we don't run validation. As well, for those functions where we no longer run validation, you no longer need to change IDs to string form, you can leave them as ObjectIDs because the validator won't be checking.