[web] Ensure that uploads are not UI-blocking and still running in suspended tabs

[JammingBen]

Description

User Stories

• As a user I want all uploads to continue flawlessly even if I leave the tab open in the background and the browser suspends it.

• As a user I want the UI to still be usable during uploads.

Value

• Improved stability for uploads
• No frustration and errors

Acceptance Criteria

• New web worker for Uploads
• UI is not blocked or sluggish during uploads operation
• Token inside the web worker is being refreshed on token renewal

Definition of ready

• [ ] Everybody needs to understand the value written in the user story
• [ ] Acceptance criteria have to be defined
• [ ] All dependencies of the user story need to be identified
• [ ] Feature should be seen from an end user perspective
• [ ] Story has to be estimated
• [ ] Story points need to be less than 20

Definition of done

• Functional requirements
  • [ ] Functionality described in the user story works
  • [ ] Acceptance criteria are fulfilled
• Quality
  • [ ] Code review happened
  • [ ] CI is green (that includes new and existing automated tests)
  • [ ] Critical code received unit tests by the developer
• Non-functional requirements
  • [ ] No sonar cloud issues

[JammingBen]

After fiddling around, I believe it is currently impossible to achieve this. The only potential solution would be to initialize Uppy in a Web Worker, as we can't pass an instance of it to the worker. However, the issue is that Uppy relies on the global window object, which can't be used inside a worker. That leaves us with no real options I'm afraid.

[dschmidt]

For reference and additional context in the issue itself: https://github.com/transloadit/uppy/issues/5238

[JammingBen]

Closing here since this is nothing we can or will do in the foreseeable future. See https://github.com/transloadit/uppy/issues/5238#issuecomment-2176226042 for further details.