Supplier Part Updates (#11303)

* Add "primary" field to SupplierPart model

* Remove "default_supplier" field from the Part model

* Ensure only one SupplierPart can be "primary" for a given Part

* Update references to "default_supplier"

* Add 'primary' field to the SupplierPart API serializer

* update SupplierPart table

* Use bulk-update operations

* Bug fix for data migration

* Allow ordering by 'primary' field

* Tweak import message

* Edit 'primary' field in UI

* Fix checks in save() methods

* Better table updates

* Update CHANGELOG

* Bump API version

* Fix unit test

* Add unit test for API

* Playwright tests

CHANGELOG.md

@@ -9,6 +9,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Breaking Changes
 
+- [#11303](https://github.com/inventree/InvenTree/pull/11303) removes the `default_supplier` field from the `Part` model. Instead, the `SupplierPart` model now has a `primary` field which is used to indicate which supplier is the default for a given part. Any external client applications which made use of the old `default_supplier` field will need to be updated.
+
 ### Added
 
 [#11222](https://github.com/inventree/InvenTree/pull/11222) adds support for data import using natural keys, allowing for easier association of related objects without needing to know their internal database IDs.