fix: resolve cli-platform-apple from cli-platform-ios path for pnpm (#2945)

## Summary
- Re-applies the fix from #2820 that was inadvertently reverted in #2917
- In pnpm setups, `@react-native-community/cli-platform-apple` is a
transitive dependency of `cli-platform-ios` and not directly resolvable
from the project root — resolve `cli-platform-ios` first and use its
path as the starting directory

Fixes #2944

## Test plan
- Verified in a pnpm monorepo that `cli-platform-apple` resolves
correctly and the `macos` platform is registered

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: Saadnajmi

packages/react-native/react-native.config.js

@@ -71,9 +71,13 @@ try {
 // [macOS
 let apple;
 try {
+  const iosPath = require.resolve('@react-native-community/cli-platform-ios', {
+    paths: [process.cwd()],
+  });
   // $FlowFixMe[untyped-import]
   apple = findCommunityPlatformPackage(
     '@react-native-community/cli-platform-apple',
+    iosPath,
   );
 } catch {
   if (verbose) {