AC-252: Refactor core MFTF TinyMCE Section

- update stepKey to be unique

Author: xmav

app/code/Magento/Cms/Test/Mftf/Test/AdminAddVariableToWYSIWYGBlockTest.xml

@@ -97,7 +97,7 @@
         <click selector="{{CmsPagesPageActionsSection.edit('$$createCMSPage.identifier$$')}}" stepKey="clickEdit" />
         <waitForPageLoad stepKey="waitForPageLoad8" />
         <click selector="{{CmsNewPagePageContentSection.header}}" stepKey="clickContentTab" />
-        <waitForElementVisible selector="{{TinyMCESection.TinyMCE}}" stepKey="waitForTinyMCE"/>
+        <waitForElementVisible selector="{{TinyMCESection.TinyMCE}}" stepKey="waitForTinyMCE1"/>
         <seeElement selector="{{TinyMCESection.InsertWidgetIcon}}" stepKey="seeWidgetIcon" />
         <click selector="{{TinyMCESection.InsertWidgetIcon}}" stepKey="clickInsertWidgetIcon" />
         <waitForPageLoad stepKey="waitForPageLoad9" />

app/code/Magento/Cms/Test/Mftf/Test/AdminAddWidgetToWYSIWYGBlockTest.xml

@@ -48,7 +48,7 @@
         <actionGroup ref="NavigateToCreatedCMSPageActionGroup" stepKey="navigateToCreatedCMSPage">
             <argument name="CMSPage" value="$$createCMSPage$$"/>
         </actionGroup>
-        <waitForElementVisible selector="{{TinyMCESection.TinyMCE}}" stepKey="waitForTinyMCE"/>
+        <waitForElementVisible selector="{{TinyMCESection.TinyMCE}}" stepKey="waitForTinyMCE1"/>
         <seeElement selector="{{TinyMCESection.InsertWidgetIcon}}" stepKey="seeWidgetIcon" />
         <click selector="{{TinyMCESection.InsertWidgetIcon}}" stepKey="clickInsertWidgetIcon2" />
         <waitForPageLoad stepKey="waitForPageLoad5" />