project: Use user configured shells for project env fetching (#41288)

Closes https://github.com/zed-industries/zed/issues/40464

Release Notes:

- Fix shell environment sourcing not respecting users remote shells

crates/project/src/task_store.rs

@@ -317,7 +317,7 @@ fn local_task_context_for_location(
     cx.spawn(async move |cx| {
         let project_env = environment
             .update(cx, |environment, cx| {
-                environment.get_buffer_environment(&location.buffer, &worktree_store, cx)
+                environment.buffer_environment(&location.buffer, &worktree_store, cx)
             })
             .ok()?
             .await;