Log the already deleted kopia snapshot with the repository logger

Other code in the kopia repository uses its logger without a nil check,
so drop the check and give the test a logger to cover the path.

Signed-off-by: Tiger Kaovilai <tkaovila@redhat.com>
Co-Authored-By: Claude Code (model: Claude Opus 5.5) <noreply@anthropic.com>

pkg/repository/udmrepo/kopialib/lib_repo.go

@@ -748,9 +748,7 @@ func (kr *kopiaRepository) DeleteSnapshot(ctx context.Context, id udmrepo.ID) er
 			// The snapshot was already deleted, e.g. by a backup deletion that was
 			// interrupted after deleting it, so there is nothing left to do.
 			if errors.Is(err, snapshot.ErrSnapshotNotFound) {
-				if kr.logger != nil {
-					kr.logger.Infof("Snapshot %s is not found after repo refresh, it is already deleted", id)
-				}
+				kr.logger.Infof("Snapshot %s is not found after repo refresh, it is already deleted", id)
 				return nil
 			}
 			return errors.Wrap(err, "error getting snapshot after repo refresh")

pkg/repository/udmrepo/kopialib/lib_repo_test.go

@@ -1795,6 +1795,7 @@ func TestDeleteSnapshot(t *testing.T) {
 			kr := &kopiaRepository{
 				rawRepo:   rawRepo,
 				rawWriter: rawWriter,
+				logger:    velerotest.NewLogger(),
 			}
 
 			err := kr.DeleteSnapshot(t.Context(), tc.snapshotID)