[ISSUE #8804] clean offset when remove group offset

[leizhiyuan]

Which Issue(s) This PR Fixes

Fixes #8804

Brief Description

implement the clean offset,then we invoke deleteSubscriptionGroup ,we can clean

How Did You Test This Change?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 15 lines in your changes missing coverage. Please review.

Project coverage is 47.41%. Comparing base (95b1c51) to head (d9c44ff).
Report is 3 commits behind head on develop.

Files with missing lines	Patch %	Lines
...cketmq/broker/offset/LmqConsumerOffsetManager.java	0.00%	15 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #8805      +/-   ##
=============================================
- Coverage      47.47%   47.41%   -0.06%     
+ Complexity     11591    11576      -15     
=============================================
  Files           1283     1283              
  Lines          89888    89903      +15     
  Branches       11568    11571       +3     
=============================================
- Hits           42670    42629      -41     
- Misses         41981    42027      +46     
- Partials        5237     5247      +10     

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[RongtongJin]

LGTM～