MAGETWO-75104: Add image into Slide, Banner from the Stage

- Fixed MFTF tests

Author: nathanjosiah

app/code/Magento/PageBuilder/Test/Mftf/Test/AdminPageBuilderBannerCommonTest.xml

@@ -1118,7 +1118,7 @@
             <argument name="Image" value="PageBuilderBannerBackgroundImageProperty"/>
         </actionGroup>
         <actionGroup ref="saveImage" stepKey="saveImage"/>
-        <seeElement selector="{{ImageOnConfigurationPanel.imageSource(PageBuilderBannerBackgroundImageProperty.fileName)}}" stepKey="seeMainImageSource2"/>
+        <waitForElementVisible selector="{{ImageOnConfigurationPanel.imageSource(PageBuilderBannerBackgroundImageProperty.fileName)}}" stepKey="seeMainImageSource2"/>
         <comment userInput="Go to Banner slide-out to verify uploaded image" stepKey="commentGoToBannerSlideOut"/>
         <!--Verify uploaded image is displayed on slide-out-->
         <comment userInput="Verify uploaded image is displayed on slide-out" stepKey="commentVerifyImageOnSlideout"/>

app/code/Magento/PageBuilder/Test/Mftf/Test/AdminPageBuilderSlideCommonTest.xml

@@ -1096,7 +1096,7 @@
             <argument name="Image" value="PageBuilderSliderBackgroundImageProperty"/>
         </actionGroup>
         <actionGroup ref="saveImage" stepKey="saveImage"/>
-        <seeElement selector="{{ImageOnConfigurationPanel.imageSource(PageBuilderSliderBackgroundImageProperty.fileName)}}" stepKey="seeMainImageSource2"/>
+        <waitForElementVisible selector="{{ImageOnConfigurationPanel.imageSource(PageBuilderSliderBackgroundImageProperty.fileName)}}" stepKey="seeMainImageSource2"/>
         <!--Verify uploaded image is displayed on slide-out-->
         <comment userInput="Verify uploaded image is displayed on slide-out" stepKey="commentVerifyImageOnSlideout"/>
         <actionGroup ref="openSlideOptionsByIndex" stepKey="openFirstSlideOptions">