Allow using system node (#18172)

Release Notes:

- (Potentially breaking change) Zed will now use the node installed on
your $PATH (if it is more recent than v18) instead of downloading its
own. You can disable the new behavior with `{"node":
{"disable_path_lookup": true}}` in your settings. We do not yet use
system/project-local node_modules.

---------

Co-authored-by: Mikayla <mikayla@zed.dev>

crates/zed/Cargo.toml

@@ -19,6 +19,7 @@ activity_indicator.workspace = true
 anyhow.workspace = true
 assets.workspace = true
 assistant.workspace = true
+async-watch.workspace = true
 audio.workspace = true
 auto_update.workspace = true
 backtrace = "0.3"
@@ -92,6 +93,7 @@ serde_json.workspace = true
 session.workspace = true
 settings.workspace = true
 settings_ui.workspace = true
+shellexpand.workspace = true
 simplelog.workspace = true
 smol.workspace = true
 snippet_provider.workspace = true