fix!: allow values files from any directory on Zarf package create

[Racer159]

Description

Changes the behavior around Zarf values files to merge on create instead of on deploy.

Caution

Breaking Change
This change is breaking for packages that use the alpha Zarf Values feature - these packages will need to be recreated with a new version of Zarf to be deployed by that version of Zarf. (other packages not using this feature will be unaffected)

Related Issue

Fixes #4302

Checklist before merging

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

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[codecov]

Codecov Report

❌ Patch coverage is 43.90244% with 23 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/pkg/packager/layout/assemble.go	31.81%	11 Missing and 4 partials ⚠️
src/pkg/packager/deploy.go	0.00%	8 Missing ⚠️

Files with missing lines	Coverage Δ
src/internal/value/value.go	85.43% <100.00%> (+2.09%)	⬆️
src/pkg/packager/load/import.go	51.88% <100.00%> (+1.37%)	⬆️
src/pkg/packager/deploy.go	0.00% <0.00%> (ø)
src/pkg/packager/layout/assemble.go	43.77% <31.81%> (+1.37%)	⬆️

... and 2 files with indirect coverage changes

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