fix: values with zarf dev find-images

[AustinAbro321]

Description

find images is broken with values

Related Issue

Fixes #4629

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 49.12281% with 29 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/cmd/dev.go	44.44%	13 Missing and 2 partials ⚠️
src/pkg/packager/find_images.go	40.00%	4 Missing and 2 partials ⚠️
src/cmd/package.go	0.00%	3 Missing ⚠️
src/pkg/packager/packager.go	78.57%	2 Missing and 1 partial ⚠️
src/pkg/packager/inspect.go	33.33%	1 Missing and 1 partial ⚠️

Files with missing lines	Coverage Δ
src/pkg/packager/inspect.go	34.90% <33.33%> (-2.07%)	⬇️
src/cmd/package.go	38.08% <0.00%> (+0.42%)	⬆️
src/pkg/packager/packager.go	83.33% <78.57%> (-0.82%)	⬇️
src/pkg/packager/find_images.go	55.85% <40.00%> (-0.76%)	⬇️
src/cmd/dev.go	45.65% <44.44%> (-0.56%)	⬇️

... and 1 file with indirect coverage changes

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[brandtkeller]

Clear deviation on find images being resolved here. Cleaning up some of the shared logic into the helper looks good. Not sure if dev.go is the most intuitive location but otherwise not blocking. lgtm.