dhcp: fix reuse after release

[BeryJu]

Allow an IP to be re-used by the same device after the device has sent a release request

[netlify]

✅ Deploy Preview for beryju-gravity canceled.

Name	Link
🔨 Latest commit	f32b8cb
🔍 Latest deploy log	https://app.netlify.com/sites/beryju-gravity/deploys/67abd00c40a227000899ed4f

[codecov]

Bundle Report

Bundle size has no change ✅

[codecov]

Codecov Report

Attention: Patch coverage is 53.33333% with 7 lines in your changes missing coverage. Please review.

Project coverage is 70.90%. Comparing base (d4e6a43) to head (f32b8cb).

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
pkg/roles/dhcp/ipam_internal.go	50.00%	3 Missing and 1 partial ⚠️
pkg/roles/dhcp/dhcp_handler4_release.go	57.14%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1479      +/-   ##
==========================================
- Coverage   70.91%   70.90%   -0.01%     
==========================================
  Files         125      125              
  Lines        7800     7813      +13     
==========================================
+ Hits         5531     5540       +9     
- Misses       1773     1775       +2     
- Partials      496      498       +2     

Flag	Coverage Δ
e2e	42.91% <0.00%> (-0.05%)	⬇️
unittest	60.50% <53.33%> (-0.03%)	⬇️

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