autolinked package scripts use absolute path (#46186)

Summary:
A previous attempt at fixing this issue used a relative path (https://github.com/facebook/react-native/issues/45208), this doesn't work if the user runs bundle install outside of the `ios/`
folder, using the `--project-directory=ios` argument.

## Changelog:
[iOS][Fixed] support bundle install from outside the ios folder using --project-directory

Pull Request resolved: https://github.com/facebook/react-native/pull/46186

Test Plan:
Ran the command in a project with `react-native-firebase/app` using the
`--project-directory`, confirmed that it's fixed when using the absolute
path.

closes: reactwg/react-native-releases#341

Reviewed By: cipolleschi

Differential Revision: D61719821

Pulled By: blakef

fbshipit-source-id: d83429dd29c9e8cc066ab9843ad95fdfc0af8dea

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

@@ -73,6 +73,7 @@ def list_native_modules!(config_command)
     found_pods.push({
       "configurations": configurations,
       "name": name,
+      "root": package["root"],
       "path": relative_path.to_path,
       "podspec_path": podspec_path,
       "script_phases": script_phases
@@ -168,7 +169,7 @@ def link_native_modules!(config)
 
         # Support passing in a path relative to the root of the package
         if phase["path"]
-          phase["script"] = File.read(File.expand_path(phase["path"], package[:path]))
+          phase["script"] = File.read(File.expand_path(phase["path"], package[:root]))
           phase.delete("path")
         end