feat: date config user ui change

[jansenk]

TL;DR - Slightly change what the learners see when date config is set, and change how the dates are calculated

JIRA: AU-1356

Developer Checklist

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

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

Patch coverage: 98.16% and no project coverage change.

Comparison is base (94fd34b) 95.10% compared to head (71d4a56) 95.10%.

❗ Current head 71d4a56 differs from pull request most recent head 079bbe5. Consider uploading reports for the commit 079bbe5 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2041   +/-   ##
=======================================
  Coverage   95.10%   95.10%           
=======================================
  Files         158      158           
  Lines       17450    17485   +35     
  Branches     1625     1629    +4     
=======================================
+ Hits        16595    16629   +34     
- Misses        641      642    +1     
  Partials      214      214           

Flag	Coverage Δ
unittests	95.10% <98.16%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
openassessment/xblock/test/test_submission.py	100.00% <ø> (ø)
openassessment/xblock/test/test_openassessment.py	99.63% <98.09%> (-0.37%)	⬇️
openassessment/xblock/openassessmentblock.py	90.49% <100.00%> (+0.17%)	⬆️
openassessment/xblock/submission_mixin.py	85.23% <100.00%> (+0.03%)	⬆️

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[schenedx]

👍