[ISSUE #9080] Not hold final message store config in fetcher

[lizhimins]

Which Issue(s) This PR Fixes

Fixes #9080

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 47.96%. Comparing base (19393e0) to head (900db5e).

Files with missing lines	Patch %	Lines
...etmq/tieredstore/core/MessageStoreFetcherImpl.java	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #9086      +/-   ##
=============================================
- Coverage      47.97%   47.96%   -0.02%     
+ Complexity     12045    12037       -8     
=============================================
  Files           1320     1320              
  Lines          92779    92779              
  Branches       11896    11896              
=============================================
- Hits           44511    44501      -10     
- Misses         42756    42768      +12     
+ Partials        5512     5510       -2     

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