refactor: mirror-resources

[phillebaba]

Description

Re implement mirror.

Related Issue

Relates to #2969

Checklist before merging

• Test, docs, adr added or updated as needed
• Contributor Guide Steps followed

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[codecov]

Codecov Report

Attention: Patch coverage is 6.62252% with 282 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/internal/packager2/mirror.go	0.00%	133 Missing ⚠️
src/internal/packager2/load.go	6.72%	111 Missing ⚠️
src/internal/packager2/pull.go	0.00%	18 Missing ⚠️
src/cmd/package.go	0.00%	16 Missing ⚠️
src/internal/dns/dns.go	75.00%	2 Missing and 2 partials ⚠️

Files with missing lines	Coverage Δ
src/internal/dns/dns.go	75.00% <75.00%> (ø)
src/cmd/package.go	0.00% <0.00%> (ø)
src/internal/packager2/pull.go	30.87% <0.00%> (-1.30%)	⬇️
src/internal/packager2/load.go	6.72% <6.72%> (ø)
src/internal/packager2/mirror.go	0.00% <0.00%> (ø)

[phillebaba]

The tests are failing because the same registry args are used for mirror-resoruces and init. Because I changed the argument to in mirror to be similar to the git server argument it no longer works with init.