[ISSUE #7768]Improve RouteInfoManager#registerTopic readability

[mxsm]

Which Issue(s) This PR Fixes

Fixes #7768

Brief Description

Improve RouteInfoManager#registerTopic readability

How Did You Test This Change?

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (6d75134) 43.21% compared to head (fde276f) 43.19%.

Files	Patch %	Lines
...e/rocketmq/namesrv/routeinfo/RouteInfoManager.java	77.77%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #7776      +/-   ##
=============================================
- Coverage      43.21%   43.19%   -0.02%     
- Complexity      9859     9860       +1     
=============================================
  Files           1171     1171              
  Lines          85025    85016       -9     
  Branches       11015    11013       -2     
=============================================
- Hits           36744    36725      -19     
- Misses         43717    43733      +16     
+ Partials        4564     4558       -6     

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[github-actions]

This PR is stale because it has been open for 365 days with no activity. It will be closed in 3 days if no further activity occurs. If you wish not to mark it as stale, please leave a comment in this PR.

[github-actions]

This PR was closed because it has been inactive for 3 days since being marked as stale.