bucket-metadata: Reload events/repl-targets for all buckets (#20334)

Currently, the bucket events and replication targets are only reloaded
with buckets that failed to load during the first cluster startup,
which is wrong because if one bucket change was done in one node but
that node was not able to notify other nodes; the other nodes will
reload the bucket metadata config but fails to set the events and bucket
targets in the memory.

cmd/admin-bucket-handlers.go

@@ -811,6 +811,7 @@ func (a adminAPIHandlers) ImportBucketMetadataHandler(w http.ResponseWriter, r *
 			}
 
 			bucketMap[bucket].NotificationConfigXML = configData
+			bucketMap[bucket].NotificationConfigUpdatedAt = updatedAt
 			rpt.SetStatus(bucket, fileName, nil)
 		case bucketPolicyConfig:
 			// Error out if Content-Length is beyond allowed size.