MQE-1069: Migrate Sample Data tests from MTF to MFTF

Author: okolesnyk

app/code/Magento/Catalog/Test/Mftf/Section/StorefrontProductMediaSection.xml

@@ -9,7 +9,7 @@
 <sections xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:noNamespaceSchemaLocation="urn:magento:mftf:Page/etc/SectionObject.xsd">
     <section name="StorefrontProductMediaSection">
-        <element name="gallerySpinner" type="block" selector="[data-gallery-role='gallery-placeholder'] div.loader>img" />
+        <element name="gallerySpinner" type="block" selector="#maincontent .fotorama__spinner--show" />
         <element name="gallery" type="block" selector="[data-gallery-role='gallery']" />
         <element name="productImage" type="text" selector="//*[@data-gallery-role='gallery' and not(contains(@class, 'fullscreen'))]//img[contains(@src, '{{filename}}') and not(contains(@class, 'full'))]" parameterized="true" />
         <element name="productImageFullscreen" type="text" selector="//*[@data-gallery-role='gallery' and contains(@class, 'fullscreen')]//img[contains(@src, '{{filename}}') and contains(@class, 'full')]" parameterized="true" />