Enable parallel tox env launching for Windows again

[abelcheung]

Some light of hope exists to enable tox run-parallel again on Windows. It was disabled in e651dc1 due to multiple issues:

1. Most likely multiple workflows using different python interpreters and setup-uv writing cache simultaneously using the same Windows temp folder name, causing conflict.
   • Solution: Default cache key collides on Python version matrix astral-sh/setup-uv#182 seems to indicate cache of different python versions will now be written as different cache, so it could be worthwhile to tackle the problem again.
   • Task: Switch to newest setup-uv release, or directly use commit astral-sh/setup-uv@856099c
2. Multiple concurrent envs also cause pyright to create file simultaneously on the same cache folder (Concurrent runs of pyright can result in race condition RobertCraigie/pyright-python#318).
   • Solution: Switching to basedpyright could fix this issue by pre-bundling node and pyright and avoid multiple package download from net.
   • Task: Rename everywhere in config, and duplicate config for basedpyright
   • Task: Verify calling basedpyright in pytest plugin causes no surprise
   • Task: build and test GitHub workflows calls basedpyright
   • Task (optional): Can jakebailey/pyright-action and jordemort/action-pyright use basedpyright? Former one seems fine, but latter one may need forking.