Introduce esbuild on webpack (#14578)

* Vendor node mods as cache; fix esbuild/fomantic offline build

* Fix --exclude; use bsdtar for consistent globbing

* Fall back to GNU tar; forward-compatible for APT 2.0

* Avoid having extd. attrs with bsdtar

* Dependency and misc. optimizations

* Remove extra code after esbuild-loader update

Co-authored-by: Mike L <cl.jeremy@qq.com>

package.json

@@ -5,14 +5,9 @@
     "node": ">= 10.13.0"
   },
   "dependencies": {
-    "@babel/core": "7.13.10",
-    "@babel/plugin-transform-runtime": "7.13.10",
-    "@babel/preset-env": "7.13.10",
-    "@babel/runtime": "7.13.10",
     "@claviska/jquery-minicolors": "2.3.5",
     "@primer/octicons": "12.1.0",
     "add-asset-webpack-plugin": "2.0.1",
-    "babel-loader": "8.2.2",
     "clipboard": "2.0.8",
     "codemirror": "5.60.0",
     "core-js": "3.9.1",
@@ -20,6 +15,7 @@
     "css-minimizer-webpack-plugin": "1.3.0",
     "dropzone": "5.8.1",
     "easymde": "2.14.0",
+    "esbuild-loader": "2.11.0",
     "escape-goat": "3.0.0",
     "fast-glob": "3.2.5",
     "font-awesome": "4.7.0",