Run Maestro tests also in debug mode (#46573)

Summary:
This change runs Maestro tests also in Debug mode, by starting Metro in background.

## Changelog:
[Internal] - Add E2E tests in Debug mode too

Pull Request resolved: https://github.com/facebook/react-native/pull/46573

Test Plan:
GHA must be green.
Successful run: https://github.com/facebook/react-native/actions/runs/11033322135?pr=46573

Reviewed By: cortinico

Differential Revision: D63452169

Pulled By: cipolleschi

fbshipit-source-id: e04b87f6a3e7aca8519dc2cb37c982dff3c20100