Summary:
Recent changes broke the script - wrong path to open `RNTesterPods.xcworkspace` and other scripts - we change dir with `cd`.
Another change is incorrect use of `RNTesterProject.xcodeproj` instead of a `xcworkspace`.
This PR is a simple and short fix to make it run.
## Changelog
[INTERNAL] - chore: update `./scripts/test-manual-e2e.sh`
Pull Request resolved: https://github.com/facebook/react-native/pull/28653
Test Plan: Run `./scripts/test-manual-e2e.sh`. Things work.
Differential Revision: D21079792
Pulled By: hramos
fbshipit-source-id: 6bdb8be016f044852ed216ec53f80db40c84b5fd