fix(ios): make Podfile.lock SPEC CHECKSUMS deterministic across machines

Two sources of non-determinism cause Podfile.lock to differ between
machines, breaking `pod install --deployment` in CI:

1. Yoga.podspec: Dir.glob returns files in filesystem-dependent order.
   Add .sort to ensure consistent ordering regardless of OS/filesystem.

2. hermes-engine.podspec: require.resolve with __dir__ produces an
   absolute path containing the user's home directory. Compute a relative
   path from Pod::Config sandbox root and use $(PODS_ROOT) so the xcconfig
   is deterministic while supporting any project layout.

Fixes #56975

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: IsaacIsrael

packages/react-native/ReactCommon/yoga/Yoga.podspec

@@ -61,6 +61,6 @@ Pod::Spec.new do |spec|
   # Fabric must be able to access private headers (which should not be included in the umbrella header)
   all_header_files = 'yoga/**/*.h'
   all_header_files = File.join('ReactCommon/yoga', all_header_files) if ENV['INSTALL_YOGA_WITHOUT_PATH_OPTION']
-  spec.private_header_files = Dir.glob(all_header_files) - Dir.glob(public_header_files)
+  spec.private_header_files = Dir.glob(all_header_files).sort - Dir.glob(public_header_files).sort
   spec.preserve_paths = [all_header_files]
 end

packages/react-native/sdks/hermes-engine/hermes-engine.podspec

@@ -70,9 +70,14 @@ Pod::Spec.new do |spec|
       hermes_compiler_path = File.dirname(Pod::Executable.execute_command('node', ['-p',
         "require.resolve(\"hermes-compiler\", {paths: [\"#{react_native_path}\"]})", __dir__]).strip
       )
+      hermesc_path = File.join(hermes_compiler_path, 'hermesc', 'osx-bin', 'hermesc')
+
+      require 'pathname'
+      pods_root = Pod::Config.instance.sandbox.root
+      relative_hermesc = Pathname.new(hermesc_path).relative_path_from(pods_root)
 
       spec.user_target_xcconfig = {
-        'HERMES_CLI_PATH' => "#{hermes_compiler_path}/hermesc/osx-bin/hermesc"
+        'HERMES_CLI_PATH' => "$(PODS_ROOT)/#{relative_hermesc}"
       }
     end