chore: fix eslint-related issues (#2690)

* chore: 🤖 add .eslintignore for e2e-tests directory

* chore: 🤖 add auto-fixable eslint changes

* chore: 🤖 make js tasks more explicit to avoid race conditions

avoid having js files be in two separate concurrent branches where tasks
could result in race-condition writes

* chore: 🤖 expand .eslintignore to include more generated dirs

* chore: 🤖 fix additional lint-staged tasks

Fix additional lint-staged tasks that could result in race conditions

addons/auth/package.json

@@ -77,8 +77,8 @@
     "configPath": "tests/dummy/config"
   },
   "lint-staged": {
-    "*.js": "eslint --fix",
+    "*.js": ["eslint --fix", "prettier --write"],
     "*.hbs": "ember-template-lint --fix",
-    "*.{js,scss,yaml}": "prettier --write"
+    "*.{scss,yaml}": "prettier --write"
   }
 }