dhcp: migrate leases to be scope scoped instead of global

[BeryJu]

closes #1269

[netlify]

✅ Deploy Preview for beryju-gravity canceled.

Name	Link
🔨 Latest commit	412313a
🔍 Latest deploy log	https://app.netlify.com/sites/beryju-gravity/deploys/6743ebe6f7f435000822deb2

[codecov]

Codecov Report

Attention: Patch coverage is 48.11321% with 165 lines in your changes missing coverage. Please review.

Project coverage is 60.36%. Comparing base (0a66b6d) to head (412313a).

❌ We are unable to process any of the uploaded JUnit XML files. Please ensure your files are in the right format.

Files with missing lines	Patch %	Lines
pkg/roles/dhcp/role_migrations.go	0.00%	92 Missing ⚠️
pkg/roles/dhcp/api_leases.go	16.66%	34 Missing and 1 partial ⚠️
pkg/roles/dhcp/scopes.go	72.41%	12 Missing and 4 partials ⚠️
pkg/roles/dhcp/scopes_watch.go	53.33%	5 Missing and 2 partials ⚠️
pkg/roles/dhcp/scope_selector.go	86.48%	4 Missing and 1 partial ⚠️
pkg/extconfig/log.go	0.00%	2 Missing and 1 partial ⚠️
pkg/instance/api_instance.go	83.33%	2 Missing and 1 partial ⚠️
pkg/roles/dhcp/api_scopes.go	81.25%	2 Missing and 1 partial ⚠️
cmd/cli/cli_health.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1304      +/-   ##
==========================================
- Coverage   61.15%   60.36%   -0.80%     
==========================================
  Files         108      109       +1     
  Lines        6125     6221      +96     
==========================================
+ Hits         3746     3755       +9     
- Misses       2030     2116      +86     
- Partials      349      350       +1     

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[codecov]

Bundle Report

Changes will increase total bundle size by 1.67kB (0.05%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
gravity-ui-esm	3.53MB	1.67kB (0.05%) ⬆️