heal/list: Fix rare incomplete listing with flaky internode connections (#19625)

listPathRaw() counts errDiskNotFound as a valid error to indicate a
listing stream end. However, storage.WalkDir() is allowed to return
errDiskNotFound anytime since grid.ErrDisconnected is converted to
errDiskNotFound.

This affects fresh disk healing and should affect S3 listing as well.

cmd/metacache-set.go

@@ -1095,8 +1095,7 @@ func listPathRaw(ctx context.Context, opts listPathRawOptions) (err error) {
 				switch err.Error() {
 				case errFileNotFound.Error(),
 					errVolumeNotFound.Error(),
-					errUnformattedDisk.Error(),
-					errDiskNotFound.Error():
+					errUnformattedDisk.Error():
 					atEOF++
 					fnf++
 					// This is a special case, to handle bucket does