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

Adding this caught a couple of important things:
- The sound integration tests have a `.only` in them
- The project-saver-hoc tests had two tests with the same description, causing possible confusion if that test broke

Fixes #5031, which is happening because the gestureInProgress call is still returning true after a drag ends.

This reverts commit 42ff50300cff7558fd03cdebb757eca8caf85199.

This reverts commit c061f2e2, reversing
changes made to 6e007b1e.

Use the same implementation as onSetProjectThumbnailer which does the same thing for getting a thumbnail externally.

Account for the addition of locale prop expected in mapStateToProps.
Note: if/when the telemetry code gets moved into its own hoc, the prop should get removed, and the test should get updated as well.

Adds unit tests for this HOC.