Fix Go test coverage by removing the GOEXPERIMENT=nocoverageredesign

[begelundmuller]

Checklist:

• Covered by tests
• Ran it and it works as intended
• Reviewed the diff before requesting a review
• Checked for unhandled edge cases
• Linked the issues it closes
• Checked if the docs need to be updated. If so, create a separate Linear DOCS issue
• Intend to cherry-pick into the release branch
• I'm proud of this work!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 35.62%. Comparing base (cda43d4) to head (ad2c45c).
⚠️ Report is 42 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8465      +/-   ##
==========================================
- Coverage   35.64%   35.62%   -0.02%     
==========================================
  Files         673      676       +3     
  Lines       81027    81870     +843     
==========================================
+ Hits        28882    29170     +288     
- Misses      47803    48328     +525     
- Partials     4342     4372      +30     

Flag	Coverage Δ
go	35.62% <ø> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[grahamplata]

Looks good, ran it locally with no issues