dhcp: add ipam scope lock

[BeryJu]

No description provided.

[netlify]

✅ Deploy Preview for beryju-gravity canceled.

Name	Link
🔨 Latest commit	bdcd470
🔍 Latest deploy log	https://app.netlify.com/projects/beryju-gravity/deploys/6959149fe5d13000089b6956

[codecov]

Codecov Report

❌ Patch coverage is 76.92308% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.02%. Comparing base (7bfc17d) to head (bdcd470).
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
pkg/roles/dhcp/ipam_internal.go	76.92%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2010      +/-   ##
==========================================
- Coverage   70.07%   70.02%   -0.05%     
==========================================
  Files         134      134              
  Lines        7374     7386      +12     
==========================================
+ Hits         5167     5172       +5     
- Misses       1677     1682       +5     
- Partials      530      532       +2     

Flag	Coverage Δ
bench	12.43% <76.92%> (+0.04%)	⬆️
e2e	45.23% <76.92%> (+0.05%)	⬆️
unittest	56.61% <76.92%> (+0.08%)	⬆️

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