Hotfix privacy manifest aggregation script (facebook#44390)

Summary:
As pointed out by liamjones here:
facebook#44214 (comment)

The original PR did introduce a bug in the `find/first` check, but in my testing, we do need to look at `group.name`, so let's make sure we check both.

This also makes it play nice with an existing file even if it is added to a different directory, by appending to it instead of forcing it to exist in the main group.

## Changelog:

[IOS] [FIXED] - Fix privacy aggregation

Pull Request resolved: facebook#44390

Test Plan: Tested on rn-tester

Reviewed By: cipolleschi

Differential Revision: D56893594

Pulled By: philIip

fbshipit-source-id: b92589bc2bed9d07e9af20c56a8b9f6c61d864f0

Author: aleqsio

packages/react-native/scripts/cocoapods/privacy_manifest_utils.rb

@@ -7,7 +7,7 @@ module PrivacyManifestUtils
     def self.add_aggregated_privacy_manifest(installer)
         user_project = get_user_project_from(installer)
         targets = get_application_targets(user_project)
-        file_path = get_privacyinfo_file_path(user_project)
+        file_path = get_privacyinfo_file_path(user_project, targets)
 
         privacy_info = read_privacyinfo_file(file_path) || {
             "NSPrivacyCollectedDataTypes" => [],
@@ -70,13 +70,18 @@ def self.ensure_reference(file_path, user_project, target)
         reference_exists = target.resources_build_phase.files_references.any? { |file_ref| file_ref.path.end_with? "PrivacyInfo.xcprivacy" }
         unless reference_exists
             # We try to find the main group, but if it doesn't exist, we default to adding the file to the project root – both work
-            file_root = user_project.root_object.main_group.children.first { |group| group.name == target.name } || user_project
+            file_root = user_project.root_object.main_group.children.find { |group| group.class == Xcodeproj::Project::Object::PBXGroup && (group.name == target.name || group.path == target.name) } || user_project
             file_ref = file_root.new_file(file_path)
             build_file = target.resources_build_phase.add_file_reference(file_ref, true)
         end
     end
 
-    def self.get_privacyinfo_file_path(user_project)
+    def self.get_privacyinfo_file_path(user_project, targets)
+        file_refs = targets.flat_map { |target| target.resources_build_phase.files_references }
+        existing_file = file_refs.find { |file_ref| file_ref.path.end_with? "PrivacyInfo.xcprivacy" }
+        if existing_file
+            return existing_file.real_path
+        end
         # We try to find a file we know exists in the project to get the path to the main group directory
         info_plist_path = user_project.files.find { |file_ref| file_ref.name == "Info.plist" }
         if info_plist_path.nil?