Add Python venv activation support for Windows and PowerShell (#17839)

Release Notes:

- Add Python venv activation support for Windows and PowerShell

Additional:

I discovered a related bug on my Windows system. When first opening the
project, it fails to detect the virtual environment folder `.venv`.
After expanding the .venv folder in the Project Panel, it then becomes
able to detect the virtual environment folder. However, I don't know how
to fix it.