MC-20539: Fix MFTF tests to work with elasticsearch

- skipping MFTF tests until partial word search for ES is implemented

Author: dthampy

app/code/Magento/CatalogSearch/Test/Mftf/Test/SearchEntityResultsTest/QuickSearchTwoProductsWithDifferentWeightTest.xml

@@ -15,7 +15,7 @@
             <severity value="MAJOR"/>
             <testCaseId value="MC-14797"/>
             <group value="CatalogSearch"/>
-<!--            <group value="SearchEngineMysql"/>-->
+            <group value="SearchEngineElasticsearch"/>
             <group value="mtf_migrated"/>
 <!--            <skip>-->
 <!--                <issueId value="MC-18948"/>-->

app/code/Magento/LayeredNavigation/Test/Mftf/Test/ShopByButtonInMobileTest.xml

@@ -17,7 +17,7 @@
             <severity value="CRITICAL"/>
             <testCaseId value="MC-6092"/>
             <group value="LayeredNavigation"/>
-<!--            <group value="SearchEngineMysql"/>-->
+            <group value="SearchEngineElasticsearch"/>
 <!--            <skip>-->
 <!--                <issueId value="MC-18948"/>-->
 <!--            </skip>-->