[cli] fix js inspector is broken when using web SSG

[Kudo]

Why

when web SSG is enabled, pressing j to open js inspector is broken:

Opening JavaScript inspector in the browser...
Web Bundling complete 4499ms
Web Bundling complete 4524ms
FetchError: invalid json response body at http://192.168.50.38:8081/json/list reason: Unexpected token < in JSON at position 0
FetchError: invalid json response body at http://192.168.50.38:8081/json/list reason: Unexpected token < in JSON at position 0

How

originally we have #21068 fix for the HistoryFallbackMiddleware. the new middleware for SSG unfortunately does not have the fix.
i feel like the root cause is coming from middleware disorder. digging the code in deep, i found we've chained the connect app. the middleware returned from Metro.createConnectMiddleware is actually a connect app, because rn-cli will set the enhanceMiddleware and it creates the connect app under the hood.

this pr tries to reuse the connect app. without the connect app chaining, those web middlewares will be placed after the inspector proxy middleware.

also removed the #21068 hack for HistoryFallbackMiddleware in this pr.

Code References

• expo/packages/@expo/cli/src/start/server/metro/runServer-fork.ts

  Lines 63 to 67 in c1f7b41

  	const { middleware, end, metroServer } = await Metro.createConnectMiddleware(config, {
  	hasReducedPerformance,
  	waitForBundler,
  	watch,
  	});

• https://github.com/facebook/metro/blob/649864dfe053a6c96785b3cdbd4061b451b068c1/packages/metro/src/index.flow.js#L213-L219
• https://github.com/react-native-community/cli/blob/0d118e3e3fdd99a5b056884f68a82440794bf6fc/packages/cli-plugin-metro/src/commands/start/runServer.ts#L88-L96
• https://github.com/react-native-community/cli/blob/0d118e3e3fdd99a5b056884f68a82440794bf6fc/packages/cli-plugin-metro/src/commands/start/runServer.ts#L74-L96
• https://github.com/react-native-community/cli/blob/0d118e3e3fdd99a5b056884f68a82440794bf6fc/packages/cli-server-api/src/index.ts#L47

Test Plan

$ yarn create expo -t tabs@sdk-49 sdk49tabs
$ cd sdk49tabs
$ npx expo start
# press `j`

after the fix, i've checked:

1. press j
2. check http://localhost:8081/json/list returns an array
3. check http://localhost:8081/helloweb returns a html content
4. disable SSG (the "output": "static" in app.json), check http://localhost:8081/helloweb returns a html content

Checklist

• Documentation is up to date to reflect these changes (eg: https://docs.expo.dev and README.md).
• Conforms with the Documentation Writing Style Guide
• This diff will work correctly for npx expo prebuild & EAS Build (eg: updated a module plugin).

[byCedric]

Replaces #23192

[EvanBacon]

ok