[ISSUE #8334] fix: irreducible reference count of mapped file caused by held tiered storage's dispatch

[bxfjb]

Which Issue(s) This PR Fixes

Fixes #8334

Brief Description

How Did You Test This Change?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 45.45455% with 12 lines in your changes missing coverage. Please review.

Project coverage is 43.86%. Comparing base (b31e0ce) to head (90a20af). Report is 2 commits behind head on develop.

Files	Patch %	Lines
...q/tieredstore/core/MessageStoreDispatcherImpl.java	40.00%	7 Missing and 5 partials :warning:

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #8335      +/-   ##
=============================================
+ Coverage      43.21%   43.86%   +0.65%     
- Complexity     10526    10633     +107     
=============================================
  Files           1274     1274              
  Lines          88940    88945       +5     
  Branches       11434    11435       +1     
=============================================
+ Hits           38433    39017     +584     
+ Misses         45804    45001     -803     
- Partials        4703     4927     +224     

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