v23: Eliminate a dependency from a test in v23 to a package inside the runtime.
v23: Eliminate a dependency from a test in v23 to a package inside the
runtime.

This is in preparation to move the runtime implementation into an internal
package where such dependencies would be illegal.

Change-Id: Id6f31bc08e891555020d38938909815d9a1ef373

vanadium/go.v23,vanadium/go.v23,vanadium/go.v23