Add testing for file drag and drop upload

[lilachic]

Description

This is for adding testing for file drag and drop upload, continuation for #324

DoD (Definition of Done)

Test are in place either unit test for the component in Jest or

Testing

Jest or Cypress or both

[lilachic]

Plan is to do unit test for upload form first . First thoughts :

• dragging over a dropZone should highlight the drop zone
• dragging out of the container should clear any active drop zones
• dropping the file should add the file object to the field watched by form hook
• • Call dataTransfer
• -There is fileObject