Add file overwrite confirmation

Whenever a file is moved to another folder, we don’t check for the existence of a file with the same name & extension. Leading to potential unintentional overwriting.

To Reproduce Steps to reproduce the behavior:

1. Have a /dogs/oof.png and /dogs/breeds/oof.png
2. Drag the first one into the breeds folder
3. No confirmation modal is being used

We should ensure issues in https://github.com/ipfs/ipfs-webui/issues/1667 are addressed when we solve this

[jessicaschilling]

Proposed modal warnings to alleviate:

If only one file risks overwrite

• Icon is stroke_attention
• Headline is Overwrite file?
• Text is You already have a file named (funny-cat.gif) in this directory. Are you sure you want to overwrite it? This action is permanent and cannot be reversed.
• Buttons are Overwrite and Cancel

If multiple files risk overwrite This one is just a first pass at conveying concepts, and would appreciate feedback from @lidel and @rafaelramalho19. Note that this approach doesn’t give an option for iterating though the n files that would be overwritten and making a decision one by one – it’s an all-or-nothing. Would prefer the option to iterate, but don’t want to block progress in order to create a more comprehensive solution.

[SgtPooki]

@lidel was this feature ever merged, and if not, do we still want to do this?