feat/ handle saved image and new display when image is saved

[lassopicasso]

Description

Created a new hook, useImageFile, that handles saving, deleting, and retrieving the URL of the saved image.
When image is saved, we display new controller buttons according to design: download and delete.

Related Issue(s)

• closes #{issue number}

Verification/QA

• Manual functionality testing
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• UU/WCAG (follow these guidelines until we have our own)
  • I have tested with a screen reader/keyboard navigation/automated wcag validator
  • No testing done/necessary (no DOM/visual changes)
  • I want someone to help me perform accessibility testing
• User documentation @ altinn-studio-docs
  • Has been added/updated
  • No functionality has been changed/added, so no documentation is needed
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• Support in Altinn Studio
  • Issue(s) created for support in Studio
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• Sprint board
  • The original issue (or this PR itself) has been added to the Team Apps project and to the current sprint board
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• Labels
  • I have added a kind/* and backport* label to this PR for proper release notes grouping
  • I don't have permissions to add labels, please help me out

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[Magnusrm]

Very nice! 🎉