Adding support for codesign table on osquery-perf

[lucasmrod]

I missed to add support for load testing in: #23766.

for #23858

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 39 lines in your changes missing coverage. Please review.

Project coverage is 63.17%. Comparing base (fa1a714) to head (8e4855c).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/osquery-perf/agent.go	0.00%	39 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #23855      +/-   ##
==========================================
+ Coverage   63.14%   63.17%   +0.03%     
==========================================
  Files        1559     1560       +1     
  Lines      148163   148399     +236     
  Branches     3722     3722              
==========================================
+ Hits        93553    93757     +204     
- Misses      47209    47243      +34     
+ Partials     7401     7399       -2     

Flag	Coverage Δ
backend	64.02% <0.00%> (+0.03%)	⬆️

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[iansltx]

Took a few reads to understand what's going on, but this makes sense.