CP deadlock Bugfix and optimization of pg destory.

[Hooper9973]

1. fix cp deadlock, trigger back-to-back cp instead of force cp.
2. optimize pg destroy, call cp before destroying pg superblk to avoid cp first then destroy pg index table.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 23 lines in your changes missing coverage. Please review.

Project coverage is 64.04%. Comparing base (1746bcc) to head (b7b768c).
Report is 33 commits behind head on main.

Files with missing lines	Patch %	Lines
src/lib/homestore_backend/hs_pg_manager.cpp	0.00%	23 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #252      +/-   ##
==========================================
+ Coverage   63.15%   64.04%   +0.88%     
==========================================
  Files          32       33       +1     
  Lines        1900     2456     +556     
  Branches      204      291      +87     
==========================================
+ Hits         1200     1573     +373     
- Misses        600      725     +125     
- Partials      100      158      +58     

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[xiaoxichen]

lgtm if Jilong approve from IndexService point of view.