s3: DeleteBucket to use listing before returning bucket not empty error (#20301)

Use Walk(), which is a recursive listing with versioning, to check if 
the bucket has some objects before being removed. This is beneficial
because the bucket can contain multiple dangling objects in multiple
drives.

Also, this will prevent a bug where a bucket is deleted in a deployment
that has many erasure sets but the bucket contains one or few objects
not spread to enough erasure sets.

cmd/peer-s3-server.go

@@ -279,24 +279,7 @@ func deleteBucketLocal(ctx context.Context, bucket string, opts DeleteBucketOpti
 		}, index)
 	}
 
-	var recreate bool
-	errs := g.Wait()
-	for index, err := range errs {
-		if errors.Is(err, errVolumeNotEmpty) {
-			recreate = true
-		}
-		if err == nil && recreate {
-			// ignore any errors
-			localDrives[index].MakeVol(ctx, bucket)
-		}
-	}
-
-	// Since we recreated buckets and error was `not-empty`, return not-empty.
-	if recreate {
-		return errVolumeNotEmpty
-	} // for all other errors reduce by write quorum.
-
-	return reduceWriteQuorumErrs(ctx, errs, bucketOpIgnoredErrs, (len(localDrives)/2)+1)
+	return reduceWriteQuorumErrs(ctx, g.Wait(), bucketOpIgnoredErrs, (len(localDrives)/2)+1)
 }
 
 func makeBucketLocal(ctx context.Context, bucket string, opts MakeBucketOptions) error {