fix(admin-ui): Admin UI: Invalid Request Header (#5548)

**What**
Fix of https://github.com/medusajs/medusa/issues/4904

**Fixes**
Admin run development server with hostname shown Invalid Request Header

**How**
Added webpack-dev-server config [allowedHosts](https://webpack.js.org/configuration/dev-server/#devserverallowedhosts) and [webSocketUrl](https://webpack.js.org/configuration/dev-server/#websocketurl) in admin develop options to change allowlist services hostname and Web Socket Url

**Testing**
Edit medusa-config.js with hostname in admin plugin develop options
```
const plugins = [
  // ...
  {
    resolve: "@medusajs/admin",
    /** @type {import('@medusajs/admin').PluginOptions} */
    options: {
      develop: {
        allowedHosts: [
          'host.com',
          'subdomain.host.com',
          'subdomain2.host.com',
          'host2.com',
        ],
        webSocketURL: 'wss://host.com/ws'
      },
    },
  },
]
```


Co-authored-by: Oli Juhl <59018053+olivermrbl@users.noreply.github.com>

packages/admin-ui/webpack.config.dev.ts

@@ -48,6 +48,7 @@ const getDevServerConfig = () => {
         onListening: function () {
           openBrowser(`http://localhost:7001`)
         },
+        allowedHosts: 'auto',
       } as Configuration,
     },
   }