[macOS] Always execute editor instances using NSWorkspace to ensure app window is registered and activated correctly.

[bruvzg]

Fixes #54306
Fixes #54458

Precompiled .app bundle to test (ad-hoc signed so xattr -dr com.apple.quarantine /path/to/GodotTest.app before running): https://mega.nz/file/IhAXVKBR#NDtx9atZNdSQBmbHDFfi9_aemlLmJ5-qBC2sSw82iSQ

Edit: changed the link to a new one, without unrelated custom modules.

[bruvzg]

For master we probably want to do it in the less hacky way, like change get_executable_path() to return app bundle path, and create_process to check if provided path is bundle and use NSWorkspace in this case.

[NoFr1ends]

Tested your changes and it seems to have solved the issue. The editor is now correctly focused and doesn't require the workaround anymore.

[bruvzg]

So far I have not found any issues with this, should be good to go. It should not affect any other platforms and running anything else except new instances of the editor.

[akien-mga]

Thanks!