Remove obsolete `cy.server` calls

client/cypress/e2e/e2e/users/coupon.spec.js

@@ -11,10 +11,6 @@ const redeemCoupon = (coupon) => {
 };
 
 describe('Email Verification', () => {
-  beforeEach(() => {
-    cy.server();
-  });
-
   it('forwards to homepage if confirmation key is correct', () => {
     cy.viewport('macbook-15');
     cy.mockGraphql({

client/cypress/e2e/frontend/objectives/objectives-visibility.spec.js

@@ -68,7 +68,6 @@ const operations = {
 
 describe('Objective Visibility', () => {
   beforeEach(() => {
-    cy.server();
     cy.task('getSchema').then((schema) => {
       cy.mockGraphql({
         schema,

client/cypress/e2e/frontend/read-only/school-class-team.spec.js

@@ -51,7 +51,6 @@ const checkSchoolClassTeamReadOnly = (readOnly) => {
 describe('School Class and Team Management - Read only', () => {
   beforeEach(() => {
     cy.fakeLogin('rachel.green', 'test');
-    cy.server();
     cy.task('getSchema').then((schema) => {
       cy.mockGraphql({
         schema,