Task - replace img icons with svg components (#8963)

* add role=presentation to backdrop panle image

* replace img icons with svg components in InviteDialog

* replace img icon with svg component

* img icons to svg icons in MImageBody

* remove log

* img icon to svg in SecurityRoomSettingsTab

* use shared error message for media message tiles

* remove nbsp

* dont snapshot test entire rtl render response

* use aria-describedby for uploadconfirm preview

* use aria-labelledby instead

src/components/structures/BackdropPanel.tsx

@@ -36,6 +36,8 @@ export const BackdropPanel: React.FC<IProps> = ({ backgroundImage, blurMultiplie
     }
     return <div className="mx_BackdropPanel">
         <img
+            role="presentation"
+            alt=""
             style={styles}
             className="mx_BackdropPanel--image"
             src={backgroundImage} />