Add test of snapshot capability

### What is the feature/what would you like to discuss?

@adamrher noticed that we don't have any testing in place for snapshots. We may want to add snapshots to an existing 9-timestep test. One of the possible future points of failure is that the snapshots are capped at 250 pbuf variables, so the test that the snapshot is added to should probably be one that includes CLUBB.

Possible option: ERP_Ln9_Vnuopc.ne5pg3_ne5pg3_mg37.QPC6.izumi_nag.cam-outfrq9s_clubbmf

### Is there anyone in particular you want to be part of this conversation?

_No response_

### Will this change (regression test) answers?

No

### Will you be implementing this enhancement yourself?

Any CAM SE can do this