GCE/AWS: Spread PetSet volume creation across zones

Long term we plan on integrating this into the scheduler, but in the
short term we use the volume name to place it onto a zone.

We hash the volume name so we don't bias to the first few zones.

If the volume name "looks like" a PetSet volume name (ending with
-<number>) then we use the number as an offset.  In that case we hash
the base name.

Fixes #27256

pkg/controller/persistentvolume/controller.go

@@ -1125,6 +1125,7 @@ func (ctrl *PersistentVolumeController) provisionClaimOperation(claimObj interfa
 		CloudTags:                     &tags,
 		ClusterName:                   ctrl.clusterName,
 		PVName:                        pvName,
+		PVCName:                       claim.Name,
 	}
 
 	// Provision the volume