refactor(tvix/store/pathinfoservice): make more generic

We don't need Arcs in most of the cases, we're fine with some container.

Change-Id: Ic4f8acb5b9d93e2b0923bb607463fb91e9d0e4fe
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10606
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Reviewed-by: raitobezarius <tvl@lahfa.xyz>

tvix/store/src/proto/tests/grpc_pathinfoservice.rs

@@ -22,8 +22,8 @@ fn gen_grpc_service(
     let blob_service = gen_blob_service();
     let directory_service = gen_directory_service();
     Arc::new(GRPCPathInfoServiceWrapper::new(gen_pathinfo_service(
-        blob_service.into(),
-        directory_service.into(),
+        blob_service,
+        directory_service,
     )))
 }