display upload progress for new file uploads

closes CNVS-15120

test plan:
  - enable new files
  - upload a file
    - ui should display upload progress
    - screen reader should announce upload progress

Change-Id: I01d644cfbe528dfcfa2e2161a87aefd3e8d9903c
Reviewed-on: https://gerrit.instructure.com/40148
Reviewed-by: Ryan Shaw <ryan@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Jason Madsen <jmadsen@instructure.com>
QA-Review: Jason Madsen <jmadsen@instructure.com>