squash! copy: add option to strip sparse manifest lists

Clarify deletion log message with curly apostrophe

Change "deleting instance from destination manifest" to
"deleting instance from destination's manifest" (with
typographically correct curly apostrophe) to make it
clear we're modifying the destination, not the source.

This prevents user confusion about which manifest is being
modified and maintains consistent punctuation style.

Signed-off-by: Alex Guidi <aguidi@redhat.com>

Author: aguidirh

image/copy/multiple.go

@@ -130,7 +130,7 @@ func prepareInstanceOps(list internalManifest.List, instanceDigests []digest.Dig
 			!slices.Contains(options.Instances, instanceDigest) {
 			// Create delete operation if we're stripping sparse manifests
 			if options.SparseManifestListAction == StripSparseManifestList {
-				logrus.Debugf("deleting instance %s from destination manifest (%d/%d)", instanceDigest, i+1, len(instanceDigests))
+				logrus.Debugf("deleting instance %s from destination’s manifest (%d/%d)", instanceDigest, i+1, len(instanceDigests))
 				deleteOps = append(deleteOps, instanceOp{
 					op:          instanceOpDelete,
 					deleteIndex: i,