DRA: remove "sharable" from claim allocation result

Now all claims are shareable up to the limit imposed by the size of the
"reserverFor" array.

This is one of the agreed simplifications for 1.31.

pkg/scheduler/framework/plugins/dynamicresources/dynamicresources.go

@@ -1051,7 +1051,6 @@ func (pl *dynamicResources) lookupClassParameters(logger klog.Logger, class *res
 
 func (pl *dynamicResources) lookupClaimParameters(logger klog.Logger, class *resourceapi.ResourceClass, claim *resourceapi.ResourceClaim) (*resourceapi.ResourceClaimParameters, *framework.Status) {
 	defaultClaimParameters := resourceapi.ResourceClaimParameters{
-		Shareable: true,
 		DriverRequests: []resourceapi.DriverRequests{
 			{
 				DriverName: class.DriverName,