fix: suppress warning around a constructor function (#2840)

## Summary: 

Xcode 26.4 now warns about functions annotated as constructors if the
-Wglobal-constructors flag is enabled. We want that on as an error by
default so that we don't trivially get new ones added, but we need to
suppress the warning around existing code. Add this to ReactNative.

<!-- Explain the **motivation** for making this change. What existing
problem does the pull request solve? -->

## Test Plan

No testing needed; this only suppresses a compiler warning in a narrow
location.

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and their output, screenshots / videos if the pull request changes the
user interface. -->

Author: eschwieb

packages/react-native/React/Base/RCTBridgeModule.h

@@ -91,10 +91,13 @@ RCT_EXTERN_C_END
   {                                                                                 \
     return @ #js_name;                                                              \
   }                                                                                 \
+  _Pragma("clang diagnostic push")                                                  \
+  _Pragma("clang diagnostic ignored \"-Wglobal-constructors\"")                     \
   __attribute__((constructor)) static void RCT_CONCAT(initialize_, objc_name)(void) \
   {                                                                                 \
     RCTRegisterModule([objc_name class]);                                           \
-  }
+  }                                                                                 \
+  _Pragma("clang diagnostic pop")
 
 // Implemented by RCT_EXPORT_MODULE
 + (NSString *)moduleName;