Needed to switch to piping the data into `tar`. The `PATH` override
does not work on Windows. This has the added benefit that we do not
depend on any `tar` specific flags.

This brings remote execution support for the binaries.

It also updates the chain to use a newer version of `toolchain_utils` that
provides `toolchain.run` that can be passed to `ctx.actions.run#executable` to
enable passing the runfiles into the action.

For consistency with other rulesets we create.

This detects that multiple files are unpacked and identical.

The `fixture.tar` now has multiple files contained which enables
easier testing of other rules.