chore(tvix/store/pathinfosvc): remove GRPCPathInfoService::new

There's very little reason to instantiate a GRPCPathInfoService in a
context where we are not already in a tokio context.

Change-Id: Ib81d649387717cb98de8a8039f92472f727b10c1
Reviewed-on: https://cl.tvl.fyi/c/depot/+/8755
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>

tvix/store/src/pathinfoservice/grpc.rs

@@ -14,18 +14,6 @@ pub struct GRPCPathInfoService {
 }
 
 impl GRPCPathInfoService {
-    /// Construct a new [GRPCPathInfoService], by passing a handle to the tokio
-    /// runtime, and a gRPC client.
-    pub fn new(
-        tokio_handle: tokio::runtime::Handle,
-        grpc_client: proto::path_info_service_client::PathInfoServiceClient<Channel>,
-    ) -> Self {
-        Self {
-            tokio_handle,
-            grpc_client,
-        }
-    }
-
     /// construct a [GRPCDirectoryService] from a [proto::path_info_service_client::PathInfoServiceClient<Channel>].
     /// panics if called outside the context of a tokio runtime.
     pub fn from_client(