fix microsoft#164881 (microsoft#165722)

Author: sandy081

src/vs/workbench/services/extensions/common/extensionsRegistry.ts

@@ -319,11 +319,6 @@ export const schema: IJSONSchema = {
 						body: 'onView:${5:viewId}',
 						description: nls.localize('vscode.extension.activationEvents.onView', 'An activation event emitted whenever the specified view is expanded.'),
 					},
-					{
-						label: 'onIdentity',
-						body: 'onIdentity:${8:identity}',
-						description: nls.localize('vscode.extension.activationEvents.onIdentity', 'An activation event emitted whenever the specified user identity.'),
-					},
 					{
 						label: 'onUri',
 						body: 'onUri',