[refactor] Remove MPTT mixin from StockItem model (#12360)

* Remove MPTT from StockItem model

* cleanup stock fixture file

* Remove tree rebuild code for StockItem

* Adjust API

* Update CHANGELOG  and API version

* remove tree references

* Additional checks

* Remove unused tests

* Add data migration test

* fix fk fields

* Cleanup

* Tweak unit test

* Revert bulk-create in unit test

* Don't rebuild StockItem models

* Add bulk_create_and_fetch helper model

- Overcome limitations of mysql

* Add unit test for new bulk-create helper

* Apply new helper to codebase

* Adjust unit test

* bug fix

* Adjust query limits

* Remove assert

src/frontend/src/pages/stock/StockDetail.tsx

@@ -299,7 +299,7 @@ export default function StockDetail() {
         content: stockitem?.pk ? (
           <StockItemTable
             tableName='child-stock'
-            params={{ ancestor: stockitem.pk }}
+            params={{ parent: stockitem.pk }}
           />
         ) : (
           <Skeleton />