refactor(tvix/glue): simplify TvixStoreIO further

We don't need to spawn in all these places, we can just block_on
directly, this is all IO bound.

This also means, we don't need to clone any of the service handles
(except preserving clone-ability of the BlobService).

Change-Id: I7d90f4d6a263a98491caa071ada538a5197a5472
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10540
Reviewed-by: raitobezarius <tvl@lahfa.xyz>
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI

tvix/cli/src/main.rs

@@ -94,7 +94,7 @@ fn interpret(code: &str, path: Option<PathBuf>, args: &Args, explain: bool) -> b
     eval.io_handle = Box::new(tvix_glue::tvix_io::TvixIO::new(TvixStoreIO::new(
         blob_service,
         directory_service,
-        path_info_service.into(), // we need an Arc<_> here.
+        path_info_service,
         tokio_runtime.handle().clone(),
     )));