chore: update `./scripts/test-manual-e2e.sh` (#28653)
chore: update `./scripts/test-manual-e2e.sh` (#28653)

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

facebook/react-native,javache/react-native,hammerandchisel/react-native,arthuralee/react-native,facebook/react-native,pandiaraj44/react-native,hammerandchisel/react-native,hoangpham95/react-native,hoangpham95/react-native,javache/react-native,hoangpham95/react-native,arthuralee/react-native,janicduplessis/react-native,javache/react-native,arthuralee/react-native,hammerandchisel/react-native,janicduplessis/react-native,pandiaraj44/react-native,pandiaraj44/react-native,myntra/react-native,myntra/react-native,javache/react-native,facebook/react-native,janicduplessis/react-native,myntra/react-native,pandiaraj44/react-native,hoangpham95/react-native,myntra/react-native,janicduplessis/react-native,pandiaraj44/react-native,pandiaraj44/react-native,javache/react-native,facebook/react-native,myntra/react-native,myntra/react-native,facebook/react-native,hammerandchisel/react-native,facebook/react-native,facebook/react-native,hoangpham95/react-native,hoangpham95/react-native,arthuralee/react-native,arthuralee/react-native,facebook/react-native,janicduplessis/react-native,facebook/react-native,janicduplessis/react-native,myntra/react-native,pandiaraj44/react-native,hammerandchisel/react-native,javache/react-native,myntra/react-native,hoangpham95/react-native,javache/react-native,myntra/react-native,pandiaraj44/react-native,hammerandchisel/react-native,javache/react-native,hammerandchisel/react-native,hammerandchisel/react-native,janicduplessis/react-native,hoangpham95/react-native,javache/react-native,janicduplessis/react-native