[ISSUE #8164] Log more accurate for the MQClientInstance#doRebalance

[miles-ton]

Which Issue(s) This PR Fixes

Fixes #8164

Brief Description

How Did You Test This Change?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 42.90%. Comparing base (9bdc9db) to head (56b4bbf).

Files	Patch %	Lines
...rocketmq/client/impl/factory/MQClientInstance.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #8165      +/-   ##
=============================================
- Coverage      42.93%   42.90%   -0.04%     
+ Complexity     10372    10366       -6     
=============================================
  Files           1270     1270              
  Lines          88689    88689              
  Branches       11402    11402              
=============================================
- Hits           38077    38048      -29     
- Misses         45915    45937      +22     
- Partials        4697     4704       +7     

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[drpmma]

LGTM