Allow independent configuration of images for sysbox shells

[michaeljguarino]

Summary

This will allow me to test different screenrc setups much quicker

Test Plan

unit

Checklist

• [ ] If required, I have updated the Plural documentation accordingly.
• [ ] I have added tests to cover my changes.
• [ ] I have added a meaningful title and summary to convey the impact of this PR to a user.
• [ ] I have added relevant labels to this PR to help with categorization for release notes.

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cron-test-results	Visit	52b9e3fa38c0748c3020ec0b646a704c7575317b	✅
email-test-results	Visit	52b9e3fa38c0748c3020ec0b646a704c7575317b	✅
worker-test-results	Visit	52b9e3fa38c0748c3020ec0b646a704c7575317b	✅
graphql-test-results	Visit	52b9e3fa38c0748c3020ec0b646a704c7575317b	✅

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