fix: post install error in iOS after running pod install, undefined method 'path' for nil:NilClass (facebook#45095)

Summary:
After upgrading my project to the latest version of react native i.e, 0.74.2, i was getting an error when running `pod install` an the error was coming from the post install hook. Going deeper into the file tree, i found that some of the things are Nil and react native is trying to use some methods on them, so fixed those issues by using chaining operators to conditionally apply the path method on them.

## Changelog:

[Internal] - fixes the post install issue when running pod install with react native version, 0.74.2

Pull Request resolved: facebook#45095

Test Plan: Manually tested the fix. Works perfectly fine in both debug and production mode.

Reviewed By: cortinico

Differential Revision: D58863666

Pulled By: cipolleschi

fbshipit-source-id: 64459711dcf926b7544b99b542e9861c1c0f05ca

Author: Irfanwani

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

@@ -67,26 +67,34 @@ def self.read_privacyinfo_file(file_path)
     end
 
     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" }
+        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.find { |group| group.class == Xcodeproj::Project::Object::PBXGroup && (group.name == target.name || group.path == 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, 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" }
+        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?
             # return path that is sibling to .xcodeproj
+
             path = user_project.path
+
             return File.join(File.dirname(path), "PrivacyInfo.xcprivacy")
         end
         return File.join(File.dirname(info_plist_path.real_path),"PrivacyInfo.xcprivacy")
@@ -117,14 +125,15 @@ def self.get_used_required_reason_apis(installer)
             end
             end
         end
+
         return used_apis
     end
 
     def self.get_privacy_manifest_paths_from(user_project)
         privacy_manifests = user_project
             .files
             .select { |p|
-                p.path&.end_with?('PrivacyInfo.xcprivacy')
+                p&.path&.end_with?('PrivacyInfo.xcprivacy')
             }
         return privacy_manifests
     end
@@ -162,7 +171,7 @@ def self.add_privacy_manifest_if_needed(installer)
                 "NSPrivacyTracking" => false,
                 "NSPrivacyAccessedAPITypes" => get_core_accessed_apis
             }
-            path = File.join(user_project.path.parent, "PrivacyInfo.xcprivacy")
+            path = File.join(user_project&.path.parent, "PrivacyInfo.xcprivacy")
             Xcodeproj::Plist.write_to_path(privacy_manifest, path)
             Pod::UI.puts "Your app does not have a privacy manifest! A template has been generated containing Required Reasons API usage in the core React Native library. Please add the PrivacyInfo.xcprivacy file to your project and complete data use, tracking and any additional required reasons your app is using according to Apple's guidance: https://developer.apple.com/documentation/bundleresources/privacy_manifest_files. Then, you will need to manually add this file to your project in Xcode.".red
         end