remove unused var

tests/e2e/plugins/index.js

@@ -12,7 +12,7 @@
 module.exports = (on, config) => {
   // pass important env vars to cypress
   // these vars can then be used like `Cypress.env("NODE_ENV")`
-  ["SSO_COOKIE_VALUE", "NODE_ENV"].forEach(key => {
+  ["NODE_ENV"].forEach(key => {
     config.env[key] = process.env[key];
   });