util: Fix shell kind in windows based on program path (#39696)

Closes #39614

The `ShellKind` struct is built on Windows' side, meaning that when
connecting to remotes, we fall back to PowerShell construction, even if
the shell program we are spawning is a unix program.

This broke tasks creation since we are using the shell kind to construct
args:


https://github.com/zed-industries/zed/blob/d04ac864b8cb78ee888ce03323e34c17a6dd16b9/crates/project/src/terminals.rs#L149

In normal terminals this only affected activation scripts (only place
where shell kind is used)

I don't have a Windows machine to test it, so I would appreciate any
help with testing!

Release Notes:

- Fixed an issue where tasks could not be executed in Windows WSL

---------

Signed-off-by: Marco Mihai Condrache <52580954+marcocondrache@users.noreply.github.com>

crates/agent_servers/src/acp.rs

@@ -835,7 +835,10 @@ impl acp::Client for ClientDelegate {
                     .map(Shell::Program)
             })?
             .unwrap_or(task::Shell::System);
-        let (task_command, task_args) = task::ShellBuilder::new(&shell)
+        let is_windows = project
+            .read_with(&self.cx, |project, cx| project.path_style(cx).is_windows())
+            .unwrap_or(cfg!(windows));
+        let (task_command, task_args) = task::ShellBuilder::new(&shell, is_windows)
             .redirect_stdin_to_dev_null()
             .build(Some(args.command.clone()), &args.args);