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

Author: chris-olszewski

crates/turborepo-lib/src/run/builder.rs

@@ -63,7 +63,6 @@ pub struct RunBuilder {
 
 impl RunBuilder {
     pub fn new(base: CommandBase, api_auth: Option<APIAuth>) -> Result<Self, Error> {
-        let processes = ProcessManager::infer();
         let mut opts: Opts = base.args().try_into()?;
         let config = base.config()?;
         let is_linked = turborepo_api_client::is_linked(&api_auth);
@@ -88,6 +87,13 @@ impl RunBuilder {
         }
         let version = base.version();
         let experimental_ui = config.experimental_ui();
+        let processes = ProcessManager::new(
+            // We currently only use a pty if the following are met:
+            // - we're attached to a tty
+            atty::is(atty::Stream::Stdout) &&
+            // - if we're on windows, we're using the UI
+            (!cfg!(windows) || experimental_ui),
+        );
         let CommandBase { repo_root, ui, .. } = base;
         Ok(Self {
             processes,