PB-266: Video background for Slide

- Adding tests

Author: eug123

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

@@ -3441,7 +3441,7 @@
             <description value="Verify that the video background lazy load attribute works as intended when enabled."/>
             <severity value="MAJOR"/>
             <useCaseId value="PB-266"/>
-            <testCaseId value="MC-0000"/>
+            <testCaseId value="MC-31950"/>
             <group value="pagebuilder"/>
             <group value="pagebuilder-slide"/>
             <group value="pagebuilder-slideItemCommon"/>
@@ -3478,7 +3478,7 @@
             <description value="Verify that the video background lazy load attribute works as intended when enabled."/>
             <severity value="MAJOR"/>
             <useCaseId value="PB-266"/>
-            <testCaseId value="MC-0000"/>
+            <testCaseId value="MC-31951"/>
             <group value="pagebuilder"/>
             <group value="pagebuilder-slide"/>
             <group value="pagebuilder-slideItemCommon"/>