Add WinPython support to the System Python manager

[Copilot]

fixes: #1251

PET can discover WinPython environments, but the extension was silently dropping them because WinPython was not a recognized NativePythonEnvironmentKind. WinPython is a portable Windows Python distribution that belongs under the existing System Python manager alongside WindowsRegistry, WindowsStore, and GlobalPaths.

Changes

• nativePythonFinder.ts — Add winpython = 'WinPython' to the NativePythonEnvironmentKind enum to match the value emitted by PET's pet-winpython crate.
• managers/builtin/utils.ts — Add NativePythonEnvironmentKind.winpython to the refreshPythons allowlist so WinPython environments surface through the System Python manager.

WinPython falls through to the default branch in getKindName(), so it displays as Python <version> — consistent with other undecorated system Pythons.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/graphql
  • Triggering command: /usr/bin/gh gh issue list --state open --limit 5 --json number,title,labels (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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