[#75705] Bulk price policy assignment for problem orders

The commit history includes a detour with a UI similar to send notifications with checkbox selection, so we might want to do some commit squashing. This version provides a single button that attempts to assign price policies to all those missing them for the current facility, whether they're displayed on the current page or not. The one-by-one "Assign" links remain.

In the problem orders partial, two table headers changed when humanizing: The "Accounts" column now reads "Payment Source" and "Date" became "Ordered Date". They should be more consistent than before.
We've started using service objects in a couple places in this project. I think it would be nice to move what we can of this into a `PricePolicyMassAssigner` class or something of that nature. Perhaps it takes a facility. Right now those kinds of classes live in `app/support`.

OrderDetail is already big enough, it'd be nice not to make it even bigger.