storage: Hopefully de-flake TestReplicateRogueRemovedNode
storage: Hopefully de-flake TestReplicateRogueRemovedNode

Advance the clock to ensure that the range can be GC'd.
This is a shot in the dark, but my guess is that a background
scan is updating the LastReplicaGCTimestamp and preventing
this call from having an effect.

Fixes #4692

petermattis/cockroach,vivekmenezes/cockroach,paperstreet/cockroach,veteranlu/cockroach,vivekmenezes/cockroach,bg451/cockroach,bg451/cockroach,vaibhavarora/cockroach,veteranlu/cockroach,veteranlu/cockroach,vaibhavarora/cockroach,veteranlu/cockroach,vaibhavarora/cockroach,veteranlu/cockroach,maxlang/cockroach,maxlang/cockroach,bg451/cockroach,maxlang/cockroach,veteranlu/cockroach,paperstreet/cockroach,petermattis/cockroach,petermattis/cockroach,vivekmenezes/cockroach,bg451/cockroach,nieyy/cockroach,nieyy/cockroach,petermattis/cockroach,vivekmenezes/cockroach,nieyy/cockroach,maxlang/cockroach,maxlang/cockroach,glycerine/cockroach,nieyy/cockroach,petermattis/cockroach,petermattis/cockroach,cockroachdb/cockroach,sunya123/cockroach,glycerine/cockroach,paperstreet/cockroach,vivekmenezes/cockroach,cockroachdb/cockroach,vivekmenezes/cockroach,glycerine/cockroach,bg451/cockroach,paperstreet/cockroach,arjun4084346/cockroach,cockroachdb/cockroach,petermattis/cockroach,nieyy/cockroach,sunya123/cockroach,sunya123/cockroach,sunya123/cockroach,glycerine/cockroach,cockroachdb/cockroach,glycerine/cockroach,vaibhavarora/cockroach,arjun4084346/cockroach,petermattis/cockroach,veteranlu/cockroach,glycerine/cockroach,vaibhavarora/cockroach,arjun4084346/cockroach,veteranlu/cockroach,cockroachdb/cockroach,paperstreet/cockroach,bg451/cockroach,arjun4084346/cockroach,arjun4084346/cockroach,nieyy/cockroach,cockroachdb/cockroach,arjun4084346/cockroach,vivekmenezes/cockroach,nieyy/cockroach,vivekmenezes/cockroach,paperstreet/cockroach,vaibhavarora/cockroach,arjun4084346/cockroach,maxlang/cockroach,paperstreet/cockroach,bg451/cockroach,sunya123/cockroach,cockroachdb/cockroach,vaibhavarora/cockroach,sunya123/cockroach,nieyy/cockroach,paperstreet/cockroach,arjun4084346/cockroach,sunya123/cockroach,vaibhavarora/cockroach,cockroachdb/cockroach,sunya123/cockroach,maxlang/cockroach,glycerine/cockroach,glycerine/cockroach,maxlang/cockroach