feat: make lease expiration times configurable

[0x29a]

Description

By default, ORA hands off an assignment for which a peer review hasn’t been submitted to the next learner after 8 hours - some learners start a peer review, then come back the next morning and find the response gone. This PR makes lease expiration times configurable, thus preventing responses from disappearing if they're set to 24 hours, for example.

Testing instructions

1. Set both settings to 1.
2. Start a peer review, but don't submit anything.
3. After an hour, verify that your assignment has been handed off.

private-ref

[openedx-webhooks]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.09%. Comparing base (8b320d6) to head (63e5e0c).
Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2217   +/-   ##
=======================================
  Coverage   95.09%   95.09%           
=======================================
  Files         195      195           
  Lines       21479    21481    +2     
  Branches     1931     1931           
=======================================
+ Hits        20425    20427    +2     
  Misses        787      787           
  Partials      267      267           

Flag	Coverage Δ
unittests	95.09% <100.00%> (+<0.01%)	⬆️

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[itsjeyd]

Hey @0x29a, just checking in to see if this PR is still needed?

[0x29a]

@itsjeyd, yes, it is. I updated the description and marked it as ready for review.

[itsjeyd]

Thanks @0x29a. I requested a review from the maintaining team (see "Who will review my changes?" above).

Hey @openedx/2u-aurora, please have a look at this PR when you can.