chore: fix playground context menu (#8139)

tests/playgrounds/advanced_playground.html

@@ -26,7 +26,6 @@
 
       function createWorkspace(blocklyDiv, options) {
         var workspace = Blockly.inject(blocklyDiv, options);
-        workspace.configureContextMenu = configureContextMenu.bind(workspace);
         return workspace;
       }
 
@@ -101,6 +100,8 @@
           },
         };
 
+        Blockly.ContextMenuItems.registerCommentOptions();
+
         createPlayground(
           document.getElementById('root'),
           createWorkspace,
@@ -125,23 +126,6 @@
           document.body.style.backgroundColor = '#d6d6ff'; // Familliar lilac.
         }
       }
-
-      function configureContextMenu(menuOptions, e) {
-        var workspace = this;
-        var screenshotOption = {
-          text: 'Download Screenshot',
-          enabled: workspace.getTopBlocks().length,
-          callback: function () {
-            downloadScreenshot(workspace);
-          },
-        };
-        menuOptions.push(screenshotOption);
-
-        // Adds a default-sized workspace comment to the workspace.
-        menuOptions.push(
-          Blockly.ContextMenu.workspaceCommentOption(workspace, e),
-        );
-      }
       start();
     </script>