B2B-1704: Add MFTF test for MC-38621

 - Adding S3 mftf test
 - Removing pause action
 - Updating export actiongroup

Author: dhaecker

app/code/Magento/AwsS3/Test/Mftf/Test/AdminAwsS3ImportTaxRatesTest.xml

@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ /**
+  * Copyright © Magento, Inc. All rights reserved.
+  * See COPYING.txt for license details.
+  */
+-->
+
+<tests xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+       xsi:noNamespaceSchemaLocation="urn:magento:mftf:Test/etc/testSchema.xsd">
+    <test name="AdminAwsS3ImportTaxRatesTest" extends="AdminImportTaxRatesTest">
+        <annotations>
+            <features value="AwsS3"/>
+            <stories value="Import Tax"/>
+            <title value="S3 - Import and Update Tax Rates"/>
+            <description value="Imports tax rates to create new tax rates and update existing tax rates. Verifies
+            results on tax rates grid page. Sets S3 for file system."/>
+            <severity value="MAJOR"/>
+            <testCaseId value="MC-38949"/>
+            <group value="importExport"/>
+            <group value="tax"/>
+        </annotations>
+
+        <before>
+            <!-- Enable AWS S3 Remote Storage -->
+            <magentoCLI command="setup:config:set {{RemoteStorageAwsS3ConfigData.enable_options}}" stepKey="enableRemoteStorage" before="loginAsAdmin"/>
+        </before>
+
+        <after>
+            <!-- Disable AWS S3 Remote Storage -->
+            <magentoCLI command="setup:config:set {{RemoteStorageAwsS3ConfigData.disable_options}}" stepKey="disableRemoteStorage" after="logoutFromAdmin"/>
+        </after>
+    </test>
+</tests>

app/code/Magento/TaxImportExport/Test/Mftf/ActionGroup/AdminExportTaxRatesActionGroup.xml

@@ -12,5 +12,8 @@
         <annotations>
             <description>Clicks the 'Export Tax Rates' button.</description>
         </annotations>
+        <waitForElementVisible selector="{{AdminImportExportTaxRatesSection.exportTaxRatesButton}}" stepKey="waitForExportTaxRates"/>
+        <click selector="{{AdminImportExportTaxRatesSection.exportTaxRatesButton}}" stepKey="clickExportTaxRates"/>
+        <waitForPageLoad stepKey="waitForImport"/>
     </actionGroup>
 </actionGroups>

app/code/Magento/TaxImportExport/Test/Mftf/Test/AdminImportTaxRatesTest.xml

@@ -41,9 +41,6 @@
             <argument name="file" value="{{import_tax_rates.filename}}"/>
         </actionGroup>
 
-
-        <pause stepKey="pause"/>
-
         <!-- Verify Imported Tax Rates -->
         <actionGroup ref="AdminTaxRateGridOpenPageActionGroup" stepKey="navigateToTaxRatesPage"/>
         <actionGroup ref="AdminFilterLegacyGridActionGroup" stepKey="filterGridCA">