fix(darwin): remove the need for cgo when building a darwin binary on linux (cherry-pick #23507)

[gcp-cherry-pick-bot]

Cherry-picked fix(darwin): remove the need for cgo when building a darwin binary on linux (#23507)

Signed-off-by: rumstead [email protected]

[codecov]

Codecov Report

❌ Patch coverage is 73.33333% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.20%. Comparing base (d69639a) to head (98148f2).
⚠️ Report is 59 commits behind head on release-3.1.

Files with missing lines	Patch %	Lines
util/workloadidentity/workloadidentity_cgo.go	73.33%	4 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           release-3.1   #23526      +/-   ##
===============================================
- Coverage        60.25%   60.20%   -0.06%     
===============================================
  Files              344      345       +1     
  Lines            59084    59084              
===============================================
- Hits             35603    35573      -30     
- Misses           20614    20629      +15     
- Partials          2867     2882      +15     

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