ci: restore GPG cleanup step before Codecov upload

[QuantumExplorer]

Summary

• Restore the GPG cleanup step that was reverted in Revert "ci: kill stale gpg-agent and locks before Codecov upload on Mac runners" #3278
• The GPG cleanup wasn't the cause of the Codecov "Missing Head Report" issue
• Self-hosted runners still need stale keyboxd locks cleaned up

Test plan

• Verify GPG errors don't appear in Codecov upload step

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 9484fd72-a3a0-4368-b265-958aff920a7b

📥 Commits

Reviewing files that changed from the base of the PR and between a9b384d and 725cbc1.

📒 Files selected for processing (1)

• .github/workflows/tests-rs-workspace.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch ci/restore-gpg-cleanup

📝 Coding Plan

• Generate coding plan for human review comments

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.28%. Comparing base (a3419f8) to head (725cbc1).
⚠️ Report is 6 commits behind head on v3.1-dev.

Additional details and impacted files

@@             Coverage Diff              @@
##           v3.1-dev    #3279      +/-   ##
============================================
+ Coverage     67.60%   68.28%   +0.68%     
============================================
  Files          3292     3293       +1     
  Lines        259904   262598    +2694     
============================================
+ Hits         175702   179310    +3608     
+ Misses        84202    83288     -914     

Components	Coverage Δ
dpp	56.61% <ø> (+0.02%)	⬆️
drive	74.76% <ø> (+0.09%)	⬆️
drive-abci	81.44% <99.75%> (+1.85%)	⬆️
sdk	30.34% <ø> (ø)
dapi-client	39.08% <ø> (ø)
platform-version	∅ <ø> (∅)
platform-value	39.35% <ø> (ø)
platform-wallet	60.40% <ø> (ø)
drive-proof-verifier	∅ <ø> (∅)

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