Ensure that the artifacts have the right extension (facebook#49755)

Summary:
Pull Request resolved: facebook#49755

The artifacts are uploaded without the .tar.gz extension and the gradle script fails to upload them to sonatype.

This change adds the extensions.

## Changelog:
[Internal] -

Reviewed By: sammy-SC

Differential Revision: D70443149

fbshipit-source-id: c16d1842688b82ac216ffb90ecf2b75f562cca64

Author: cipolleschi

.github/workflows/prebuild-ios.yml

@@ -165,12 +165,12 @@ jobs:
       - name: Upload XCFramework Artifact
         uses: actions/upload-artifact@v4
         with:
-          name: ReactNativeDependencies${{ matrix.flavor }}.xcframework
+          name: ReactNativeDependencies${{ matrix.flavor }}.xcframework.tar.gz
           path: packages/react-native/third-party/ReactNativeDependencies${{ matrix.flavor }}.xcframework.tar.gz
       - name: Upload dSYM Artifact
         uses: actions/upload-artifact@v4
         with:
-          name: ReactNativeDependencies${{ matrix.flavor }}.framework.dSYM
+          name: ReactNativeDependencies${{ matrix.flavor }}.framework.dSYM.tar.gz
           path: |
             packages/react-native/third-party/Symbols/ReactNativeDependencies${{ matrix.flavor }}.framework.dSYM.tar.gz
       - name: Save XCFramework in Cache