fix: [2.5] remove param num_build_thread

[foxspy]

issue: #39090
pr: #39340

[mergify]

@foxspy Please associate the related pr of master to the body of your Pull Request. (eg. “pr: #”)

[liliu-z]

/lgtm
/approve

[sre-ci-robot]

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[mergify]

@foxspy go-sdk check failed, comment rerun go-sdk can trigger the job again.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.07%. Comparing base (4cb47b3) to head (cb54367).
Report is 6 commits behind head on 2.5.

Additional details and impacted files

@@            Coverage Diff             @@
##              2.5   #39341      +/-   ##
==========================================
+ Coverage   81.04%   81.07%   +0.02%     
==========================================
  Files        1404     1404              
  Lines      197402   197454      +52     
==========================================
+ Hits       159983   160080      +97     
+ Misses      31799    31759      -40     
+ Partials     5620     5615       -5     

Components	Coverage Δ
Client	78.26% <ø> (ø)
Core	69.50% <ø> (ø)
Go	83.05% <ø> (+0.03%)	⬆️

Files with missing lines	Coverage Δ
pkg/util/paramtable/knowhere_param.go	83.13% <ø> (-0.21%)	⬇️

... and 45 files with indirect coverage changes

[liliu-z]

rerun go-sdk