ENGCOM-4480: Fix Broken Tax Rate Search Filter Admin grid #21521 #21701

 - Merge Pull Request #21701 from tuyennn/magento2:2.3-issues-21521
 - Merged commits:
   1. 924dca2

Author: magento-engcom-team

app/code/Magento/Tax/etc/di.xml

@@ -143,6 +143,7 @@
         <arguments>
             <argument name="fieldMapping" xsi:type="array">
                 <item name="id" xsi:type="string">tax_calculation_rule_id</item>
+                <item name="code" xsi:type="string">main_table.code</item>
                 <item name="tax_rate_ids" xsi:type="string">tax_calculation_rate_id</item>
                 <item name="customer_tax_class_ids" xsi:type="string">cd.customer_tax_class_id</item>
                 <item name="product_tax_class_ids" xsi:type="string">cd.product_tax_class_id</item>
@@ -154,6 +155,7 @@
         <arguments>
             <argument name="fieldMapping" xsi:type="array">
                 <item name="id" xsi:type="string">tax_calculation_rule_id</item>
+                <item name="code" xsi:type="string">main_table.code</item>
                 <item name="tax_rate_ids" xsi:type="string">tax_calculation_rate_id</item>
                 <item name="customer_tax_class_ids" xsi:type="string">cd.customer_tax_class_id</item>
                 <item name="product_tax_class_ids" xsi:type="string">cd.product_tax_class_id</item>