Skip deleted objects in lifecycle requeue batch instead of aborting

When replaying failed archive batches, a deleted object causes
ObjNotFound in handleBatch which aborts async.reduce and silently drops
all remaining objects. Log the error and continue processing.

Author: maeldonn

extensions/lifecycle/tasks/LifecycleRequeueTask.js

@@ -141,6 +141,12 @@ class LifecycleRequeueTask extends BackbeatTask {
                             log,
                             (err, res) => {
                                 if (err) {
+                                    if (err.name === 'ObjNotFound') {
+                                        log.error('object not found, skipping', {
+                                            bucketName, objectKey, objectVersion,
+                                        });
+                                        return nextObject(null, objsPerBucket);
+                                    }
                                     return nextObject(err);
                                 }