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

• [x] Reviewed the release process
• [x] Translations and JS/SASS compiled
• [x] 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

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[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 95.29%. Comparing base (3418d7b) to head (e733351). :warning: Report is 7 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2237   +/-   ##
=======================================
  Coverage   95.29%   95.29%           
=======================================
  Files         195      195           
  Lines       21664    21664           
  Branches     1509     1509           
=======================================
  Hits        20644    20644           
  Misses        771      771           
  Partials      249      249           

Flag	Coverage Δ
unittests	95.29% <100.00%> (ø)

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[itsjeyd]

@viadanna Since this is a user-facing change it will need to go through product review. You can get that process started by creating a product proposal and pinging #wg-product-core on Slack to find a coordinator (cf. docs).

CC @kaustavb12

[pomegranited]

@viadanna @kaustavb12 Once Product is done with their review, feel free to ping me for a CC review & merge.

[itsjeyd]

Hey @viadanna, checking in to see if you've had a chance yet to ping #wg-product-core on Slack to find a coordinator for the product proposal (https://github.com/openedx/platform-roadmap/issues/387) for this PR?

[viadanna]

@itsjeyd Yes, I did, but got no answer yet.

[viadanna]

@pomegranited this is good for CC review.

[viadanna]

@pomegranited are you able to create a new release from the tag 6.16.4 so we can bump this on master?