[Enhancement] Abstract registerIncrementBrokerData for single topic update into a method

[joeCarf]

Before Creating the Enhancement Request

• I have confirmed that this should be classified as an enhancement rather than a bug/feature.

Summary

linked issue: #7334
linked pr: https://github.com/apache/rocketmq/pull/7335/files

there are duplicate codes, so I think it's better to abstract them into a method.

Motivation

there are duplicate codes, so I think it's better to abstract them into a method.

Describe the Solution You'd Like

abstract duplicate codes into a method.

Describe Alternatives You've Considered

null

Additional Context

No response