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/prettier/src/prettier.rs

@@ -138,7 +138,7 @@ impl Prettier {
     pub async fn start(
         _: LanguageServerId,
         prettier_dir: PathBuf,
-        _: Arc<dyn NodeRuntime>,
+        _: NodeRuntime,
         _: AsyncAppContext,
     ) -> anyhow::Result<Self> {
         Ok(Self::Test(TestPrettier {
@@ -151,7 +151,7 @@ impl Prettier {
     pub async fn start(
         server_id: LanguageServerId,
         prettier_dir: PathBuf,
-        node: Arc<dyn NodeRuntime>,
+        node: NodeRuntime,
         cx: AsyncAppContext,
     ) -> anyhow::Result<Self> {
         use lsp::LanguageServerBinary;