draft of refactor to make custom confirm modal work for upload; need to further edit sb-file-uploader
Add support for custom confirm modal to sb-file-uploader
Show custom confirm modal when confirming project upload
got custom upload refactor of file upload working, and tested failure case
cleaned up debug code, make project file upload work
simplified logic around canceling file upload
removed old sb-file-uploader.jsx; fixed linter errors
reverted two components to use old strings, not shared
(can do that refactor another time)
removed unnecessary confirm container
removed stray comment
moved, updated sb file uploader tests, related project state tests
removed custom modal, to reduce scope of changes
sb file uploader test uses intl