MC-2356: MFTF Test Enhancements

- Adding assertion after slide duplication to help prevent flakiness

Author: dhaecker

app/code/Magento/PageBuilder/Test/Mftf/ActionGroup/SliderActionGroup.xml

@@ -58,6 +58,7 @@
         <seeElement selector="{{SliderInAdmin.slideOptions}}" stepKey="seeContentBlockOptionsMenu"/>
         <click selector="{{SliderInAdmin.slideOptionsDuplicate}}" stepKey="clickRemoveContentBlock"/>
         <waitForPageLoad stepKey="waitForPageLoad"/>
+        <waitForElementVisible selector="{{SlideOnBackend.slideContainer('1', '2')}}" stepKey="waitForDuplicateSlide"/>
     </actionGroup>
     <actionGroup name="addSlide">
         <waitForElementVisible time="10" selector="{{SliderInAdmin.sliderContainer}}" stepKey="waitForContentTypeInStageVisible" />

app/code/Magento/PageBuilder/Test/Mftf/Section/PageBuilderSliderSection.xml

@@ -144,6 +144,7 @@
         <element name="slideLinkURL2" type="button" selector="[data-slick-index='1'] .pagebuilder-slide-button[data-link-url='{{arg1}}']" parameterized="true"/>
         <element name="slideBackgroundImage" type="text" selector="[data-slick-index='{{arg1}}'] .pagebuilder-slide-wrapper >div[style*='background-image: url'][style*='{{arg2}}'][style*='{{arg3}}']" parameterized="true"/>
         <element name="slide" type="button" selector="[data-slick-index='{{arg1}}'] .pagebuilder-slide" parameterized="true"/>
+        <element name="slideContainer" type="button" selector="((//div[contains(@class,'pagebuilder-slider')])[{{arg1}}]//div[contains(@class,'pagebuilder-slide') and @data-slide-name])[{{arg2}}]" parameterized="true"/>
         <element name="backgroundImageSource" type="button" selector="//div[contains(@style, '{{arg1}}')]" parameterized="true"/>
         <element name="messageText" type="text" selector="//div/p[text()='{{arg1}}']" parameterized="true"/>
         <element name="buttonText" type="text" selector="//a//span[text()='{{arg1}}']" parameterized="true"/>