GNNE-1714:adjust for processor counter

[uranus0515]

1, Adjust the number of processors used for egraph search to half of the total number of processors.

[github-actions]

Test Results

5 859 tests  ±0   5 859 ✅ ±0   8m 15s ⏱️ -23s
    6 suites ±0       0 💤 ±0 
    6 files   ±0       0 ❌ ±0 

Results for commit 435f2a6. ± Comparison against base commit c232f96.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c232f96) 72.88% compared to head (435f2a6) 72.89%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1150   +/-   ##
=======================================
  Coverage   72.88%   72.89%           
=======================================
  Files         706      706           
  Lines       25922    25923    +1     
  Branches     4227     4227           
=======================================
+ Hits        18894    18896    +2     
  Misses       6384     6384           
+ Partials      644      643    -1     

Flag	Coverage Δ
integration	38.97% <100.00%> (+<0.01%)	⬆️
unit	64.77% <100.00%> (+<0.01%)	⬆️

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