Remove worker-loader (#23548)

[`worker-loader`](https://github.com/webpack-contrib/worker-loader) is
deprecated since webpack 5 which can load workers without it now, so
remove it. I think it was already dysfunctional because the regex does
not match our current worker scripts:

```
web_src/js/features/eventsource.sharedworker.js
web_src/js/features/serviceworker.js
web_src/js/serviceworker.js
```

I did confirm that eventsource worker still loads via simple
`console.log` inside the script.

Co-authored-by: delvh <leon@kske.dev>

webpack.config.js

@@ -111,18 +111,6 @@ export default {
         exclude: /node_modules/,
         loader: 'vue-loader',
       },
-      {
-        test: /\.worker\.js$/,
-        exclude: /monaco/,
-        use: [
-          {
-            loader: 'worker-loader',
-            options: {
-              inline: 'no-fallback',
-            },
-          },
-        ],
-      },
       {
         test: /\.js$/,
         exclude: /node_modules/,