add wait for sandbox editor

packages/app/test/cypress/integration/20-basic-features/access-to-page.spec.ts

@@ -39,6 +39,8 @@ context('Access to page', () => {
 
   it('/Sandbox with edit is successfully loaded', () => {
     cy.visit('/Sandbox#edit');
+    // eslint-disable-next-line cypress/no-unnecessary-waiting
+    cy.wait(500);
     cy.screenshot(`${ssPrefix}-sandbox-edit-page`);
   })