Pass keep_checkpoint_every_n_hours to Checkpointer (and internal checkpoint_manager).
Pass keep_checkpoint_every_n_hours to Checkpointer (and internal checkpoint_manager).

PiperOrigin-RevId: 314322287
Change-Id: I1092dced21189d26157edd6eadc1178939112d67

deepmind/acme,deepmind/acme