Disable uploading files while an upload is in progress

[viadanna]

This PR disables the upload button and shows a spinner during uploads so continuing to click the upload button doesn't flood the LMS with requests.

What changed?

• Disables the Upload Files button when upload starts.
• Shows a spinner to indicate to the learner an upload is in progress.
• Toggle both when the upload finishes or fails.

Developer Checklist

• Reviewed the release process
• Translations and JS/SASS compiled
• Bumped version number in openassessment/__init__.py and package.json

Testing Instructions

1. Deploy this version of the xblock to a devstack or instance.
2. Create a course and add the xblock.
3. Edit the xblock settings to allow uploads.
4. Go to the xblock in the LMS.
5. Open the browser developer console and set throttling to 3G.
6. Select a few files and click Upload files.
7. Confirm the button is disabled and a spinner appears.
8. Disable throttling in the developer console.
9. Confirm the button is enabled again and the spinner disappears when the upload finishes.

Reviewer Checklist

Collectively, these should be completed by reviewers of this PR:

• I've done a visual code review
• I've tested the new functionality

FYI: @openedx/content-aurora

[openedx-webhooks]

Thanks for the pull request, @viadanna!

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.12%. Comparing base (a33db7f) to head (15148c5).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2237   +/-   ##
=======================================
  Coverage   95.12%   95.12%           
=======================================
  Files         195      195           
  Lines       21601    21601           
  Branches     1936     1936           
=======================================
  Hits        20547    20547           
  Misses        786      786           
  Partials      268      268           

Flag	Coverage Δ
unittests	95.12% <100.00%> (ø)

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[kaustavb12]

👍

• I tested this: Tested in local devstack
• I read through the code