fix(dev-middleware): allow inspector proxy to fetch sourcemaps on lan connections (#43307)

Summary:
The inspector proxy is inlining source maps on `Debugger.scriptParsed` CDP events. The inlining prevents Chrome DevTools from downloading this remotely, as that's not supported in newer versions anymore.

The current implementation locks this inlining mechanism to just `localhost` and/or `127.0.0.1` addresses, making it incompatible with LAN or tunnel device connections.

This PR removes that limitation to allow source map inlining on these LAN and tunnel connections.

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[GENERAL][FIXED] Allow Inspector proxy to inline source maps on LAN connections

Pull Request resolved: https://github.com/facebook/react-native/pull/43307

Test Plan:
- See added test
- Start Metro and connect a device over LAN, open the chrome devtools

Reviewed By: huntie

Differential Revision: D54485247

Pulled By: robhogan

fbshipit-source-id: 6fcb0c6dd762d2f0a013497ba0a1126095b9130b

packages/dev-middleware/src/inspector-proxy/Device.js

@@ -758,10 +758,6 @@ export default class Device {
   // Fetch text, raising an exception if the text could not be fetched,
   // or is too large.
   async #fetchText(url: URL): Promise<string> {
-    if (!['localhost', '127.0.0.1'].includes(url.hostname)) {
-      throw new Error('remote fetches not permitted');
-    }
-
     // $FlowFixMe[incompatible-call] Suppress arvr node-fetch flow error
     const response = await fetch(url);
     if (!response.ok) {