[Feature] External build order (#9312)

* Add BuildOrder reference to PurchaseOrderLineItem

* Add setting to enable / disable external build orders

* Fix for supplier part detail

* Update forms

* Filter build list by "external" status

* Add "external" attribute to BuildOrder

* Filter by external build when selecting against purchase order line item

* Add frontend elements

* Prevent creation of build outputs

* Tweak related model field

- Send filters when fetching initial data

* Fix migrations

* Fix some existing typos

* Add build info when receiving line items

* Logic fix

* Bump API version

* Updated relationship

* Add external orders tab for order

* Display table of external purchase orders against a build order

* Fix permissions

* Tweak field definition

* Add unit tests

* Tweak api_version.py

* Playwright testing

* Fix discrepancy in 'building' filter

* Add basic documentation

( more work required )

* Tweak docs macros

* Migration fix

* Adjust build page tabs

* Fix imports

* Fix broken import

* Update playywright tests

* Bump API version

* Handle DB issues

* Improve filter

* Cleaner code

* Fix column ordering bug

* Add filters to build output table

* Documentation

* Tweak unit test

* Add "scheduled_for_production" field

* Add helper function to part model

* Cleanup

docs/mkdocs.yml

@@ -167,6 +167,7 @@ nav:
     - Build Orders: manufacturing/build.md
     - Build Outputs: manufacturing/output.md
     - Allocating Stock: manufacturing/allocate.md
+    - External Manufacturing: manufacturing/external.md
     - Example Build Order: manufacturing/example.md
   - Purchasing:
     - Purchasing: purchasing/index.md