Marking the variation as migrated to MFTF

Author: eduard13

dev/tests/functional/tests/app/Magento/Variable/Test/TestCase/CreateCustomVariableEntityTest.xml

@@ -13,6 +13,7 @@
             <data name="customVariable/data/name" xsi:type="string">variableName%isolation%</data>
             <data name="customVariable/data/html_value" xsi:type="string">&lt;h1&gt;variableName%isolation%&lt;/h1&gt;</data>
             <data name="customVariable/data/plain_value" xsi:type="string">&lt;p&gt;variablePlainText%isolation%&lt;/p&gt;</data>
+            <data name="tag" xsi:type="string">mftf_migrated:yes</data>
             <constraint name="Magento\Variable\Test\Constraint\AssertCustomVariableSuccessSaveMessage" />
             <constraint name="Magento\Variable\Test\Constraint\AssertCustomVariableInGrid" />
             <constraint name="Magento\Variable\Test\Constraint\AssertCustomVariableForm" />