feat:- fix compilation issue with objcxx interop (#55117)

Summary:
So currently RN app is broken with following error if the `SWIFT_OBJC_INTEROP_MODE` is changed to `objcxx`.
<img width="567" height="112" alt="image" src="https://github.com/user-attachments/assets/7a8e8cf4-a8a3-42d3-a65f-9943cbf296f2" />

### Why do we need this interop ?
So currently any pod that uses `objcxx` as interop (For example Any library created with Nitro modules) cannot be  imported into App directly .
<img width="548" height="59" alt="image" src="https://github.com/user-attachments/assets/b6d9fb7a-00df-4bf2-aa0c-c61fb3a6538f" />

We are using this in a nitro module where we override bundle url . And nitro-player for jellify app where we create a new scene for carplay . Currently we are using hacky stuffs like creating two pods to address this but the solution is messy.
### RCA for failing
<img width="633" height="155" alt="image" src="https://github.com/user-attachments/assets/7eb811cc-d1ba-410d-902c-4217bfc47b40" />

Currently glog imports some things inside namespace which is not allowed.

### Fix
This patches creates a module map that uses textual headers to prevent submodule creation. We can still keep using the old interop by default . Users who need to do this can change the interop themselves

bypass-github-export-checks

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[IOS][FIXED] - Fix glog namespace issue to allow using interop mode of objcxx

Pull Request resolved: #55117

Test Plan:
To test this I forked Nightly repo and ran against all the libraries and nothing seems to fail
With objcxx interop :- https://github.com/riteshshukla04/nightly-tests/actions/runs/20908210967
with Objc interop :- https://github.com/riteshshukla04/nightly-tests/actions/runs/20902452877

Reviewed By: cortinico

Differential Revision: D90503097

Pulled By: cipolleschi

fbshipit-source-id: c1b46e901ec1515998428e1f3ca46f9d48d17bd3

Author: riteshshukla04

packages/react-native/scripts/ios-configure-glog.sh

@@ -102,3 +102,21 @@ cp -f src/glog/logging.h "$EXPORTED_INCLUDE_DIR/"
 cp -f src/glog/raw_logging.h "$EXPORTED_INCLUDE_DIR/"
 cp -f src/glog/stl_logging.h "$EXPORTED_INCLUDE_DIR/"
 cp -f src/glog/vlog_is_on.h "$EXPORTED_INCLUDE_DIR/"
+
+
+# Create a custom module.modulemap that works with Swift C++ interop
+# The issue is that glog headers include other headers inside namespace blocks
+# which Clang treats as module imports inside namespaces (which is illegal)
+# Solution: Use textual headers to prevent submodule creation
+cat > src/glog/module.modulemap << 'MODULEMAP'
+module glog {
+     // Use textual headers to avoid submodule generation
+     // This prevents the "import within namespace" error with Swift C++ interop
+     textual header "log_severity.h"
+     textual header "logging.h"
+     textual header "raw_logging.h"
+     textual header "stl_logging.h"
+     textual header "vlog_is_on.h"
+     export *
+}
+MODULEMAP

packages/react-native/third-party-podspecs/glog.podspec

@@ -33,6 +33,7 @@ Pod::Spec.new do |spec|
   spec.exclude_files       = "src/windows/**/*"
   spec.compiler_flags      = '-Wno-shorten-64-to-32'
   spec.resource_bundles = {'glog_privacy' => 'glog/PrivacyInfo.xcprivacy'}
+  spec.module_map = 'src/glog/module.modulemap'
 
   spec.pod_target_xcconfig = {
     "USE_HEADERMAP" => "NO",