ME: revert image input component

[LHBruneton-C2C]

Description

This PR introduces reverts a few changes done in #909 that were breaking the Storybook build.

Quality Assurance Checklist

• Commit history is devoid of any merge commits and readable to facilitate reviews
• If new logic ⚙️ is introduced: unit tests were added
• If new user stories 🤏 are introduced: E2E tests were added
• If new UI components 🕹️ are introduced: corresponding stories in Storybook were created
• If breaking changes 🪚 are introduced: add the breaking change label
• If bugs 🐞 are fixed: add the backport <release branch> label
• The documentation website 📚 has received the love it deserves

[github-actions]

Affected libs: feature-editor, ui-inputs, feature-dataviz, feature-record, feature-router, feature-search, feature-map, ui-elements, feature-notifications, feature-catalog, ui-catalog, ui-search, ui-layout,
Affected apps: metadata-editor, datafeeder, demo, metadata-converter, datahub, webcomponents, search, map-viewer,

• 🚀 Build and deploy storybook and demo on GitHub Pages
• 📦 Build and push affected docker images

[github-actions]

📷 Screenshots are here!

[jahow]

I think this is the only really necessary change; the type should be switched back to string, and the overview-upload component should be adapted accordingly

[coveralls]

coverage: 81.158% (-2.4%) from 83.543%
when pulling e92f231 on ME/fix-graphic-overview
into ac57b75 on main.