feat: enable windows pty (#7780)
### Description
Closes #7176
We still limit PTY usage to only those opted into the new UI as ConPTY
emits a clear screen command on startup. While this is still undesired
with the UI, it is far less disrupted as the command is contained to our
task pane instead of the entire terminal.
### Testing Instructions
On Windows:
```
npx create-turbo with-vite npm -e with-vite
set TURBO_EXPERIMENTAL_UI=true
turbo_dev --skip-infer dev
```
Closes TURBO-2659
