Open tasks for Uppy

[JammingBen]

This issue contains a list of Uppy-related open tasks after #6202 has been merged.

• Polish upload-info-box -> Polish the upload overlay #6837
  • Parent folder links are hard to read in dark mode
  • "Upload successful" message is displayed even on upload errors
• Add possibility to remove successful uploads from the upload-info-box -> we decided against this
• Fix links in the upload-info-box when resources were uploaded to the personal space root -> Fix root folder links in the upload overlay #6846
• Remove ProgressBar component and inProgress state -> [full-ci] Remove the upload progress bar and its related states #6825
• UppyService shouldn't extend Vue - use own event implementation instead (https://github.com/owncloud/web/pull/6202/files#r850141613) -> Use our EventBus for upload related actions #6853
• Refactor file- and folder-upload-components to one component -> Refactor upload inputs into one component #6859
• Add unit tests -> [tests-only] Add unit tests for the uppy implementation #6871
• Use tus for uploads to password protected public pages when possible (needs Authorization for tus-uploads on password protected links ocis#3588 to be fixed first) -> Enable tus upload for password protected public links #6890
• a11y

needs product decision first:

• Thumbnails for files in the upload-info-box (?) // not sure, yet, if this makes the UI too chaotic. seeing it (with a quick and dirty implementation or with a mockup) side by side with and without thumbnails would be beneficial for decision making @kulmann -> not for now

[pascalwengerter]

I'd like to promote fixing #2443 here - folders uploaded via drop-links are getting "flattened"

[pascalwengerter]

Also, maybe we can give #2222 another look in the process and finally resolve it through our E2E tests