Clean up watchdog tasks on scan exit

[TheTechromancer]

Minor housekeeping as these tasks weren't being cleaned up properly.

[github-actions]

📊 Performance Benchmark Report

Comparing dev (baseline) vs fix-uncleanedup-watchdogs (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	4.19ms	4.25ms	+1.4% ⚪	✅
Bloom Filter Large Scale Dns Brute Force	18.05ms	18.20ms	+0.8% ⚪	✅
Large Closest Match Lookup	358.61ms	347.35ms	-3.1% ⚪	✅
Realistic Closest Match Workload	195.17ms	194.44ms	-0.4% ⚪	✅
Event Validation Full Scan Startup Small Batch	459.03ms	467.94ms	+1.9% ⚪	✅
Event Validation Full Scan Startup Large Batch	807.80ms	811.63ms	+0.5% ⚪	✅
Make Event Autodetection Small	31.37ms	31.21ms	-0.5% ⚪	✅
Make Event Autodetection Large	318.81ms	319.30ms	+0.2% ⚪	✅
Make Event Explicit Types	13.95ms	14.05ms	+0.7% ⚪	✅
Excavate Single Thread Small	7.951s	4.107s	-48.3% 🟢🟢🟢	🚀
Excavate Single Thread Large	9.607s	9.669s	+0.6% ⚪	✅
Excavate Parallel Tasks Small	4.289s	4.276s	-0.3% ⚪	✅
Excavate Parallel Tasks Large	7.187s	7.182s	-0.1% ⚪	✅
Is Ip Performance	3.19ms	3.17ms	-0.4% ⚪	✅
Make Ip Type Performance	11.35ms	11.48ms	+1.1% ⚪	✅
Mixed Ip Operations	4.54ms	4.52ms	-0.4% ⚪	✅
Typical Queue Shuffle	62.07µs	62.53µs	+0.7% ⚪	✅
Priority Queue Shuffle	698.01µs	705.47µs	+1.1% ⚪	✅

🎯 Performance Summary

+ 1 improvement 🚀
  17 unchanged ✅

🔍 Significant Changes (>10%)

• Excavate Single Thread Small: 48.3% 🚀 faster

---

🐍 Python Version 3.11.14

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92%. Comparing base (55f68e5) to head (66d0018).
⚠️ Report is 2 commits behind head on dev.

Additional details and impacted files

@@          Coverage Diff          @@
##             dev   #2783   +/-   ##
=====================================
- Coverage     92%     92%   -0%     
=====================================
  Files        410     410           
  Lines      33933   33933           
=====================================
- Hits       30983   30966   -17     
- Misses      2950    2967   +17     

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