Build/Test Tools: Remove the dependency on a globally installed Grunt.

The existing `"grunt": "grunt"` script in `package.json` allows for the use of `npm run grunt ...` which uses the local `grunt` binary in the project's `node_modules`.

Fixes #47380


git-svn-id: https://develop.svn.wordpress.org/trunk@45445 602fd350-edb4-49c9-b593-d223f7449a82

package.json

@@ -19,7 +19,7 @@
 		"check-node-version": "3.2.0",
 		"copy-webpack-plugin": "^4.6.0",
 		"cssnano": "4.1.8",
-		"grunt": "~1.0.3",
+		"grunt": "1.0.4",
 		"grunt-banner": "^0.6.0",
 		"grunt-contrib-clean": "~2.0.0",
 		"grunt-contrib-concat": "~1.0.0",
@@ -46,7 +46,7 @@
 		"matchdep": "~2.0.0",
 		"node-sass": "~4.12.0",
 		"source-map-loader": "^0.2.4",
-		"uglify-js": "^3.4.9",
+		"uglify-js": "3.5.15",
 		"uglifyjs-webpack-plugin": "2.1.1",
 		"webpack": "4.29.2",
 		"webpack-dev-server": "3.1.14",
@@ -113,6 +113,10 @@
 		"whatwg-fetch": "3.0.0"
 	},
 	"scripts": {
+		"build": "grunt build",
+		"dev": "grunt build --dev",
+		"test": "grunt test",
+		"watch": "grunt watch",
 		"grunt": "grunt"
 	}
 }