set min reclaim pool size for multi region

[yadzhang]

What type of PR is this?

fix

What this PR does / why we need it:

set min reclaimed pool size to 8 in multi share region scene

Which issue(s) this PR fixes:

to fix machine hung for the priority inversion problem caused by a sudden drop in reclaim pool size.

Special notes for your reviewer:

[codecov]

Codecov Report

Attention: Patch coverage is 14.28571% with 18 lines in your changes missing coverage. Please review.

Project coverage is 56.85%. Comparing base (f3d81a4) to head (2cbbb55).

Files with missing lines	Patch %	Lines
...u/assembler/provisionassembler/assembler_common.go	14.28%	16 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #761      +/-   ##
==========================================
+ Coverage   56.83%   56.85%   +0.02%     
==========================================
  Files         606      606              
  Lines       69941    69962      +21     
==========================================
+ Hits        39748    39776      +28     
- Misses      25927    25934       +7     
+ Partials     4266     4252      -14     

Flag	Coverage Δ
unittest	56.85% <14.28%> (+0.02%)	⬆️

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