fix(module:popconfirm): reverting missing nzPopconfirmVisibleChange (#7338)

Author: volvachev

components/popconfirm/popconfirm.ts

@@ -76,6 +76,8 @@ export class NzPopconfirmDirective extends NzTooltipBaseDirective {
   @Input() @WithConfig() nzPopconfirmBackdrop?: boolean = false;
   @Input() @WithConfig() nzAutofocus: NzAutoFocusType = null;
 
+  // eslint-disable-next-line @angular-eslint/no-output-rename
+  @Output('nzPopconfirmVisibleChange') override readonly visibleChange = new EventEmitter<boolean>();
   @Output() readonly nzOnCancel = new EventEmitter<void>();
   @Output() readonly nzOnConfirm = new EventEmitter<void>();