Implement signing for React Native core (#51919)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/51919

Implement signing for the React Native core XCFramework

The implementation follows the same approach we used for the ReactNativedependencies archive

## Changelog
[Internal] -

Reviewed By: cortinico

Differential Revision: D76337972

fbshipit-source-id: 74f61c087b31e4087752cd60bea59db15f00321b

packages/react-native/scripts/ios-prebuild.js

@@ -71,7 +71,13 @@ async function main() {
     if (cli.tasks.compose) {
       const productsFolder = computeProductsFolder(outputFolder);
       const frameworkPaths = computeFrameworkPaths(productsFolder);
-      buildXCFrameworks(root, buildFolder, frameworkPaths, buildType);
+      buildXCFrameworks(
+        root,
+        buildFolder,
+        frameworkPaths,
+        buildType,
+        cli.identity,
+      );
     }
 
     // Done!

packages/react-native/scripts/ios-prebuild/xcframework.js

@@ -138,6 +138,10 @@ function buildXCFrameworks(
     fs.mkdirSync(outputFolder, {recursive: true});
     execSync(`cp -r ${symbol} ${outputFolder}`);
   });
+
+  if (identity) {
+    signXCFramework(identity, outputPath);
+  }
 }
 
 function copyHeaderFiles(
@@ -353,6 +357,16 @@ function extractDestinationFromPath(symbolPath /*: string */) /*: string */ {
     `Impossible to extract destination from ${symbolPath}. Valid destinations are iphoneos, iphonesimulator and catalyst.`,
   );
 }
+
+function signXCFramework(
+  identity /*: string */,
+  xcframeworkPath /*: string */,
+) {
+  console.log('Signing XCFramework...');
+  const command = `codesign --timestamp --sign "${identity}" ${xcframeworkPath}`;
+  execSync(command, {stdio: 'inherit'});
+}
+
 module.exports = {
   buildXCFrameworks,
 };