Move /e2e -> /e2e-tests

e2e-tests/cypress/tests/support/ui/cloud_billing.js

@@ -0,0 +1,9 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+Cypress.Commands.add('uiGetPaymentCardInput', () => {
+    return cy.
+        get('.__PrivateStripeElement > iframe').
+        its('0.contentDocument.body').should('not.be.empty').
+        then(cy.wrap);
+});