ci: kill stale gpg-agent and locks before Codecov upload on Mac runners

[QuantumExplorer]

Summary

• Add gpgconf --kill all before the Codecov upload step on Mac runners
• Self-hosted runners accumulate stale keyboxd locks between runs, causing GPG signature verification to hang with database_open waiting for lock errors

Test plan

• Verify Codecov upload succeeds on Mac runner without GPG lock errors

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 5c8fabc0-791b-421e-b512-92b1668e889b

📥 Commits

Reviewing files that changed from the base of the PR and between 78800af and 3bd0262.

📒 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 fix/gpg-lock-codecov

📝 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 67.47%. Comparing base (e7d4fef) to head (3bd0262).
⚠️ Report is 4 commits behind head on v3.1-dev.

Additional details and impacted files

@@             Coverage Diff              @@
##           v3.1-dev    #3269      +/-   ##
============================================
- Coverage     69.39%   67.47%   -1.92%     
============================================
  Files          3292     3292              
  Lines        257616   258981    +1365     
============================================
- Hits         178763   174747    -4016     
- Misses        78853    84234    +5381     

Components	Coverage Δ
dpp	56.58% <ø> (-1.68%)	⬇️
drive	74.67% <ø> (-2.96%)	⬇️
drive-abci	79.26% <ø> (-1.57%)	⬇️
sdk	30.34% <ø> (-0.91%)	⬇️
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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