windows: Detect pwsh (#25713)

Closes #22015


Release Notes:

- N/A

crates/task/src/lib.rs

@@ -434,8 +434,10 @@ impl ShellBuilder {
 
     // `alacritty_terminal` uses this as default on Windows. See:
     // https://github.com/alacritty/alacritty/blob/0d4ab7bca43213d96ddfe40048fc0f922543c6f8/alacritty_terminal/src/tty/windows/mod.rs#L130
+    // We could use `util::retrieve_system_shell()` here, but we are running tasks here, so leave it to `powershell.exe`
+    // should be okay.
     fn system_shell() -> String {
-        "powershell".to_owned()
+        "powershell.exe".to_string()
     }
 
     fn to_windows_shell_variable(&self, input: String) -> String {