fix(ci): cypress ci issue (element-plus#5289)

- Replace localhost with 127.0.0.1
- Add feature flag for headless Chrome

Author: jw-foss

cypress.json

@@ -1,4 +1,4 @@
 {
   "video": false,
-  "baseUrl": "http://localhost:5001/en-US/"
+  "baseUrl": "http://127.0.0.1:5001/en-US/"
 }

cypress/plugins/index.js

@@ -17,7 +17,15 @@
  * @type {Cypress.PluginConfig}
  */
 // eslint-disable-next-line no-unused-vars
-module.exports = (_on, _config) => {
+module.exports = (on, _config) => {
+  on('before:browser:launch', (browser = {}, args) => {
+    if (browser.name === 'chrome') {
+      // ^ make sure this is your browser name, you may
+      // be using 'canary' or 'chromium' for example, so change it to match!
+      args.push('--proxy-bypass-list=<-loopback>')
+      return args
+    }
+  })
   // `on` is used to hook into various events Cypress emits
   // `config` is the resolved Cypress config
 }