Extension refactor (#20305)

This contains the main changes to the extensions crate from #20049. The
primary goal here is removing dependencies that we can't include on the
remote.


Release Notes:

- N/A

---------

Co-authored-by: Mikayla <mikayla@zed.dev>
Co-authored-by: Marshall Bowers <elliott.codes@gmail.com>
Co-authored-by: Marshall <marshall@zed.dev>

crates/remote_server/src/headless_project.rs

@@ -78,7 +78,7 @@ impl HeadlessProject {
         });
         let prettier_store = cx.new_model(|cx| {
             PrettierStore::new(
-                node_runtime,
+                node_runtime.clone(),
                 fs.clone(),
                 languages.clone(),
                 worktree_store.clone(),
@@ -124,7 +124,7 @@ impl HeadlessProject {
                 toolchain_store.clone(),
                 environment,
                 languages.clone(),
-                http_client,
+                http_client.clone(),
                 fs.clone(),
                 cx,
             );