Adds ability to partially scrap build outputs (#4846)

* BuildOrder updates:

- Use batch code generation when creating a new build output
- Allow partial scrapping of build outputs

* Fixes for stock table

* Bump API version

* Update unit tests

InvenTree/build/test_api.py

@@ -1027,12 +1027,15 @@ class BuildOutputScrapTest(BuildAPITest):
                 'outputs': [
                     {
                         'output': outputs[0].pk,
+                        'quantity': outputs[0].quantity,
                     },
                     {
                         'output': outputs[1].pk,
+                        'quantity': outputs[1].quantity,
                     },
                     {
                         'output': outputs[2].pk,
+                        'quantity': outputs[2].quantity,
                     },
                 ],
                 'location': 1,