Parallelize new disks healing of different erasure sets (#15112)

- Always reformat all disks when a new disk is detected, this will
  ensure new uploads to be written in new fresh disks
- Always heal all buckets first when an erasure set started to be healed
- Use a lock to prevent two disks belonging to different nodes but in
  the same erasure set to be healed in parallel
- Heal different sets in parallel

Bonus:
- Avoid logging errUnformattedDisk when a new fresh disk is inserted but
  not detected by healing mechanism yet (10 seconds lag)

cmd/erasure-metadata-utils.go

@@ -151,6 +151,7 @@ func readAllFileInfo(ctx context.Context, disks []StorageAPI, bucket, object, ve
 			errVolumeNotFound,
 			errFileVersionNotFound,
 			errDiskNotFound,
+			errUnformattedDisk,
 		}...) {
 			logger.LogOnceIf(ctx, fmt.Errorf("Drive %s, path (%s/%s) returned an error (%w)",
 				disks[index], bucket, object, err),