API Tree filters (#6536)

* PartCategoryList: Add FilterSet class

* Update PartCategory filters

- Migrate all custom filtering to the FilterSet

* Logic updates

* Revert deleted code

* Implement similar filters for StockLocation list API

* Update API docs

* Unit test updates

* More fix

* Fix for StockLocation filterclass

* Fix PUI tables

* Cleanup CUI tables

* Updated unit tests

src/frontend/src/tables/part/PartCategoryTable.tsx

@@ -138,7 +138,7 @@ export function PartCategoryTable({ parentId }: { parentId?: any }) {
         props={{
           enableDownload: true,
           params: {
-            parent: parentId ?? 'null'
+            parent: parentId
           },
           tableFilters: tableFilters,
           tableActions: tableActions,

src/frontend/src/tables/stock/StockLocationTable.tsx

@@ -148,7 +148,7 @@ export function StockLocationTable({ parentId }: { parentId?: any }) {
         props={{
           enableDownload: true,
           params: {
-            parent: parentId ?? 'null'
+            parent: parentId
           },
           tableFilters: tableFilters,
           tableActions: tableActions,