Drop legacy cli-server-api reference in dev server

Summary:
Actions TODO comment dependant on react-native-community/cli#2605 (landed).

This drops our local dependency on `react-native-community/cli-server-api` Flow types, as well as avoiding this transient dependency in end user projects.

**Other changes**

- Promote `debug` log to a user-facing `warn` — several features in RN will break/degrade in this case and we want to flag explicitly.

Changelog: [Internal]

Differential Revision: D113412986

Author: huntie

flow-typed/npm/@react-native-community/cli-server-api_v19.x.x.js

@@ -70,23 +70,12 @@ export default function loadCommunityMiddleware(): DevServerMiddlewareFactory {
   try {
     // `@react-native-community/cli` is an optional peer dependency of this
     // package, and should be a dev dependency of the host project (via the
-    // community template's package.json).
-    const communityCliPath = require.resolve('@react-native-community/cli');
-
-    // Until https://github.com/react-native-community/cli/pull/2605 lands,
-    // we need to find `@react-native-community/cli-server-api` via
-    // `@react-native-community/cli`. Once that lands, we can simply
-    // require('@react-native-community/cli').
-    const communityCliServerApiPath = require.resolve(
-      '@react-native-community/cli-server-api',
-      {paths: [communityCliPath]},
-    );
-    // $FlowFixMe[unsupported-syntax] dynamic import
-    return require(communityCliServerApiPath)
-      .createDevServerMiddleware as CreateDevServerMiddleware;
+    // community template's package.json). Required dynamically so its types
+    // aren't needed at build time.
+    return require('@react-native-community/cli').createDevServerMiddleware;
   } catch {
-    debug(`⚠️ Unable to find @react-native-community/cli-server-api
-Starting the server without the community middleware.`);
+    console.warn(`⚠️ Unable to find @react-native-community/cli.
+Starting dev server without community middleware endpoints - some functionality may be broken.`);
     return communityMiddlewareFallback;
   }
 }