feat: Add file delete UI and refine upload naming

[OmarBrbutovic]

What this PR does / why we need it:

• Added delete functionality to the UI, allowing users to remove previously uploaded files
• Expand and improve the file naming logic
• Minor optimizations and code cleanups in the file handling components
• Fix backend to properly handle file deletions for all files

Additional documentation e.g. usage docs, diagrams, reviewer notes, etc.:

Screenshoots

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