[ISSUE #8772] Remove lock mq step in broadcasting mode rebalancing

[redlsz]

Which Issue(s) This PR Fixes

Fixes #8772

Brief Description

How Did You Test This Change?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 47.37%. Comparing base (551c8c3) to head (f3f7ea0).

Files with missing lines	Patch %	Lines
...e/rocketmq/client/impl/consumer/RebalanceImpl.java	50.00%	0 Missing and 1 partial :warning:

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #8774      +/-   ##
=============================================
+ Coverage      47.32%   47.37%   +0.04%     
- Complexity     11547    11558      +11     
=============================================
  Files           1282     1282              
  Lines          89864    89864              
  Branches       11563    11563              
=============================================
+ Hits           42530    42570      +40     
+ Misses         42076    42039      -37     
+ Partials        5258     5255       -3     

Flag	Coverage Δ
	47.37% <50.00%> (+0.04%)	:arrow_up:

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