feat: set variables on find images

[AustinAbro321]

Description

Currently when you run zarf prepare find images with a package that has variables in it, the variables don't get set, even to their defaults. This can break the helm chart, or make us unable to find images. This PR introduces a deploy-set cli option. Additionally we take in the default values to the chart

Type of change

• [X] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Other (security config, docs update, etc)

Checklist before merging

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

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