feat(v1beta1): load v1beta1 packages

[AustinAbro321]

Description

Related Issue

Relates to #3433

Checklist before merging

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

[codecov]

Codecov Report

❌ Patch coverage is 75.75758% with 176 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/pkg/packager/load/import_v1beta1_merge.go	47.82%	67 Missing and 17 partials ⚠️
src/pkg/packager/load/import_v1beta1.go	81.61%	16 Missing and 9 partials ⚠️
src/pkg/packager/load/load.go	65.21%	18 Missing and 6 partials ⚠️
src/internal/pkgcfg/pkgcfg.go	68.00%	11 Missing and 5 partials ⚠️
src/internal/api/v1beta1/validate.go	93.47%	6 Missing and 3 partials ⚠️
src/cmd/dev.go	0.00%	6 Missing ⚠️
src/pkg/lint/schema.go	45.45%	4 Missing and 2 partials ⚠️
src/internal/api/v1alpha1/migrate.go	97.84%	2 Missing and 1 partial ⚠️
src/pkg/zoci/fetch.go	40.00%	2 Missing and 1 partial ⚠️

Files with missing lines	Coverage Δ
src/api/convert/convert.go	100.00% <100.00%> (ø)
src/internal/api/v1alpha1/convert.go	92.79% <100.00%> (+2.32%)	⬆️
src/internal/api/v1beta1/convert.go	97.43% <100.00%> (+<0.01%)	⬆️
src/pkg/packager/layout/oci.go	76.80% <100.00%> (+0.12%)	⬆️
src/pkg/packager/layout/package.go	70.51% <100.00%> (+0.05%)	⬆️
src/pkg/packager/load/import.go	55.72% <100.00%> (ø)
src/pkg/schema/schema.go	100.00% <100.00%> (ø)
src/internal/api/v1alpha1/migrate.go	97.84% <97.84%> (ø)
src/pkg/zoci/fetch.go	35.71% <40.00%> (-1.79%)	⬇️
src/cmd/dev.go	38.64% <0.00%> (-0.05%)	⬇️
... and 6 more

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