refactor(tvix/castore/directorysvc/grpc/wrapper): no Arc<_>

We can also drop the Clone requirement. Because the trait is async since
some time, there's no need to clone before moving into an async closure,
allowing us to simplify the code a bit.

Change-Id: I9b0a0e10077d8c548d218207b908bfd92c5b8de0
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10515
Tested-by: BuildkiteCI
Reviewed-by: raitobezarius <tvl@lahfa.xyz>
Autosubmit: flokli <flokli@flokli.de>

tvix/castore/src/utils.rs

@@ -35,7 +35,7 @@ pub(crate) async fn gen_directorysvc_grpc_client() -> DirectoryServiceClient<Cha
         // spin up a new DirectoryService
         let mut server = Server::builder();
         let router = server.add_service(DirectoryServiceServer::new(
-            GRPCDirectoryServiceWrapper::from(gen_directory_service()),
+            GRPCDirectoryServiceWrapper::new(gen_directory_service()),
         ));
 
         router