Disable flaky test

client/cypress/integration/frontend/read-only/assignment.student.spec.js

@@ -79,7 +79,8 @@ describe('Assignments read-only - Student', () => {
     cy.getByDataCy('submission-form-submit').should('exist');
   });
 
-  it('can not edit or turn in', () => {
+  // todo: very flaky test, fix and re-enable
+  it.skip('can not edit or turn in', () => {
     cy.mockGraphqlOps({
       operations: getOperations({final: false, readOnly: true})
     });