Fix benchmark report: uv.lock conflict, duplicate comments, broken formatting

[liquidsec]

Summary

• uv.lock conflict: git clean -fd before branch checkouts so generated lock files (e.g. uv.lock created by uv run on a Poetry branch) don't block switching back to branches that track those files
• Duplicate comments: Extracted comment find/update logic into shared upsertComment() helper so both success and failure paths search for existing comments before posting — previously the fallback always called createComment(), which is how PR Migrate from Poetry to UV #2900 accumulated 6 duplicate comments
• Broken formatting: Replaced .join('\\n') with a template literal — in the YAML | block, '\\n' produced literal backslash-n characters instead of newlines, rendering the fallback comment as one long unformatted line

Test plan

• Open a PR against 3.0 that touches bbot/**/*.py to trigger the benchmark workflow
• Verify the benchmark report renders correctly with proper markdown formatting
• Push again to the same PR and verify the existing comment is updated (not a new one created)
• If the report script fails, verify the fallback message also updates the existing comment and renders with proper newlines

[github-actions]

📊 Performance Benchmark Report

Comparing 3.0 (baseline) vs fix-benchmarks-3-0 (current)

📈 Detailed Results (All Benchmarks)

📋 Complete results for all benchmarks - includes both significant and insignificant changes

🧪 Test Name	📏 Base	📏 Current	📈 Change	🎯 Status
Bloom Filter Dns Mutation Tracking Performance	4.27ms	4.28ms	+0.2% ⚪	✅
Bloom Filter Large Scale Dns Brute Force	17.80ms	17.67ms	-0.7% ⚪	✅
Large Closest Match Lookup	361.90ms	348.70ms	-3.6% ⚪	✅
Realistic Closest Match Workload	196.64ms	195.10ms	-0.8% ⚪	✅
Event Validation Full Scan Startup Small Batch	513.50ms	522.12ms	+1.7% ⚪	✅
Event Validation Full Scan Startup Large Batch	940.61ms	934.03ms	-0.7% ⚪	✅
Make Event Autodetection Small	31.46ms	31.42ms	-0.1% ⚪	✅
Make Event Autodetection Large	318.07ms	312.79ms	-1.7% ⚪	✅
Make Event Explicit Types	14.19ms	13.91ms	-1.9% ⚪	✅
Excavate Single Thread Small	4.180s	4.116s	-1.5% ⚪	✅
Excavate Single Thread Large	10.051s	10.180s	+1.3% ⚪	✅
Excavate Parallel Tasks Small	4.406s	4.280s	-2.9% ⚪	✅
Excavate Parallel Tasks Large	7.512s	7.396s	-1.5% ⚪	✅
Is Ip Performance	3.16ms	3.18ms	+0.6% ⚪	✅
Make Ip Type Performance	11.47ms	11.29ms	-1.7% ⚪	✅
Mixed Ip Operations	4.48ms	4.49ms	+0.3% ⚪	✅
Typical Queue Shuffle	61.63µs	61.51µs	-0.2% ⚪	✅
Priority Queue Shuffle	705.10µs	704.17µs	-0.1% ⚪	✅

🎯 Performance Summary

✅ No significant performance changes detected (all changes <10%)

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🐍 Python Version 3.11.14

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92%. Comparing base (eb8d28b) to head (081586d).
⚠️ Report is 7 commits behind head on 3.0.

Additional details and impacted files

@@          Coverage Diff          @@
##             3.0   #2932   +/-   ##
=====================================
- Coverage     92%     92%   -0%     
=====================================
  Files        434     434           
  Lines      35493   35496    +3     
=====================================
- Hits       32400   32390   -10     
- Misses      3093    3106   +13     

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