fix: fix eslint errors when using airbnb + cypress

Author: yyx990803

packages/@vue/cli-plugin-e2e-cypress/generator/index.js

@@ -1,6 +1,7 @@
 module.exports = api => {
   api.render('./template', {
-    hasTS: api.hasPlugin('typescript')
+    hasTS: api.hasPlugin('typescript'),
+    hasESLint: api.hasPlugin('eslint')
   })
 
   api.extendPackage({

packages/@vue/cli-plugin-e2e-cypress/generator/template/test/e2e/_eslintrc

@@ -0,0 +1,13 @@
+<%_ if (hasESLint) { _%>
+{
+  "env": {
+    "mocha": true
+  },
+  "globals": {
+    "cy": false,
+    "Cypress": false,
+    "expect": false,
+    "assert": false
+  }
+}
+<%_ } _%>

packages/@vue/cli-plugin-e2e-cypress/generator/template/test/e2e/plugins/index.js

@@ -1,10 +1,11 @@
 // https://docs.cypress.io/guides/guides/plugins-guide.html
 
 module.exports = (on, config) => {
-  config.fixturesFolder = 'test/e2e/fixtures'
-  config.integrationFolder = 'test/e2e/specs'
-  config.screenshotsFolder = 'test/e2e/screenshots'
-  config.videosFolder = 'test/e2e/videos'
-  config.supportFile = 'test/e2e/support/index.js'
-  return config
+  return Object.assign({}, config, {
+    fixturesFolder: 'test/e2e/fixtures',
+    integrationFolder: 'test/e2e/specs',
+    screenshotsFolder: 'test/e2e/screenshots',
+    videosFolder: 'test/e2e/videos',
+    supportFile: 'test/e2e/support/index.js'
+  })
 }