fix: update podspec to not compile tests along with the library (#771)

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- [ ] I have performed a self-review of my code
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Author: chmjkb

packages/react-native-executorch/react-native-executorch.podspec

@@ -71,7 +71,7 @@ Pod::Spec.new do |s|
   # react-native-skia. The headers are preserved by preserve_paths and
   # then made available by HEADER_SEARCH_PATHS.
   s.exclude_files = [
-    "common/rnexecutorch/tests/*.{cpp}",
+    "common/rnexecutorch/tests/**/*.{cpp}",
     "common/rnexecutorch/jsi/*.{h,hpp}"
   ]
   s.header_mappings_dir = "common/rnexecutorch"