* feat: Search by billing_address and shipping_address on Order model
**What**
Added `.searchable()` method to the `shipping_address` and `billing_address` relationships in the `Order` model, enabling search functionality.
**Why**
Previously searching via `shipping_address` and `billing_address` was not supported, limiting the ability to find orders based on shipping or billing address information.
Resolves SUP-1838
* Update integration tests to include billing_address and non-existing addresses.
fbf33885f5