Stock API filtering fix (#4350)

* Improve filtering options for StockItem list

- Make use of StockFilter introspection

* Remove outdated filter

* remove outdated "max_results" parameter

* Fix cascade issue for stocklist API

* Add relationship filters to the StockItemFilter

* Fix filtering by 'status' and 'allocated'

* Refactor 'customer' and 'expired' filters

* Cleanup

* Adds unit test for top-level stock location filtering

InvenTree/templates/InvenTree/index.html

@@ -109,7 +109,7 @@ addHeaderAction('latest-parts', '{% trans "Latest Parts" %}', 'fa-newspaper');
 loadSimplePartTable("#table-latest-parts", "{% url 'api-part-list' %}", {
     params: {
         ordering: "-creation_date",
-        max_results: {% settings_value "PART_RECENT_COUNT" user=request.user %},
+        limit: {% settings_value "PART_RECENT_COUNT" user=request.user %},
     },
     name: 'latest_parts',
 });
@@ -147,7 +147,7 @@ loadStockTable($('#table-recently-updated-stock'), {
     params: {
         part_detail: true,
         ordering: "-updated",
-        max_results: {% settings_value "STOCK_RECENT_COUNT" user=request.user %},
+        limit: {% settings_value "STOCK_RECENT_COUNT" user=request.user %},
     },
     name: 'recently-updated-stock',
     grouping: false,

InvenTree/templates/js/translated/stock.js

@@ -2742,7 +2742,7 @@ function loadInstalledInTable(table, options) {
     table.inventreeTable({
         url: '{% url "api-stock-list" %}',
         queryParams: {
-            installed_in: options.stock_item,
+            belongs_to: options.stock_item,
             part_detail: true,
         },
         formatNoMatches: function() {