chore: make loading a bit more appealing

[leangseu-edx]

What changed?

• [ More in depth breakdown of changes ]

Developer Checklist

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

Testing Instructions

[ How should a reviewer test this PR? ]

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d88d1a7) 94.94% compared to head (483772f) 94.94%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2139   +/-   ##
=======================================
  Coverage   94.94%   94.94%           
=======================================
  Files         191      191           
  Lines       20515    20515           
  Branches     1858     1858           
=======================================
  Hits        19478    19478           
  Misses        777      777           
  Partials      260      260           

Flag	Coverage Δ
unittests	94.94% <ø> (ø)

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