chore: replace npm-run-all2 with a native script (#664)

Author: lumirlumir

packages/espree/package.json

@@ -46,7 +46,6 @@
     "@rollup/plugin-node-resolve": "^15.3.0",
     "eslint-release": "^3.2.0",
     "esprima-fb": "^8001.2001.0-dev-harmony-fb",
-    "npm-run-all2": "^6.2.2",
     "rollup": "^2.79.1",
     "shelljs": "^0.8.5"
   },
@@ -70,7 +69,7 @@
     "release:generate:beta": "eslint-generate-prerelease beta",
     "release:generate:rc": "eslint-generate-prerelease rc",
     "release:publish": "eslint-publish-release",
-    "test": "npm-run-all -s test:*",
+    "test": "npm run test:cjs && npm run test:esm",
     "test:cjs": "mocha --color --reporter progress --timeout 30000 tests/lib/commonjs.cjs",
     "test:esm": "c8 mocha --color --reporter progress --timeout 30000 tests/lib/**/*.js"
   }