Ensure line items are correctly scoped for producers

[Matt-Yorkley]

What? Why?

Closes #8473

What should we test?

For orders which contain items from multiple producers, only those supplied by the current user should be shown.

Release notes

Fixed supplied items visibility issue in packing reports

Changelog Category: Technical changes

[mkllnk]

Nice.

[filipefurtad0]

Hey @Matt-Yorkley ,

I've checked the behavior again, before this PR:

Indeed, a supplier whose items were on a given order would see entries on the packing reports from items from other suppliers. Items from orders on that OC without items from that supplier seemed not to appear in the report.
So, I was not able to exactly reproduce the Current Behavior, in which it is clearly stated that a supplier sees entries from other suppliers, from all orders.

So, before staging, an order with items from two suppliers (on is the OC coordinator), as seem from a non-coordinating supplier:

After this PR:

• as a supplier whose items are on a given order
  

• the OC coordinator should still see all the orders
  

This works for both report types 👍
I'd say we are good to go.