Add data-test-id attribute to dashboard image

Author: can-angun

plugins/dashboards/frontend/public/templates/email.html

@@ -99,7 +99,7 @@
                     <td>
                         <table width="100%" align="center" border="0" cellspacing="0" cellpadding="0">
                             <tr>
-                                <td align="center" style="padding-top: 0px;" ><img alt="Dashboard" src="<%= typeof localhost !== 'undefined' ? localhost : host %>/dashboards/images/screenshots/<%= image.name %>" width="750" style="display: block;" border="0"></img></td>
+                                <td align="center" style="padding-top: 0px;" ><img alt="Dashboard" src="<%= typeof localhost !== 'undefined' ? localhost : host %>/dashboards/images/screenshots/<%= image.name %>" width="750" style="display: block;" border="0" data-test-id="report-image"></img></td>
                             </tr>
                         </table>
                     </td>
@@ -142,4 +142,4 @@
 <!-- /Gmail hack -->
 
 </body>
-</html>
+</html>