add delay to final score recomputation
add delay to final score recomputation

refs CNVS-17456
this commit adds a 30 second delay, in production, to the final
score computation on the callback of submission when it's score
is changed.

Test plan
- In a production environment, change the score of a submission.
- The enrollment's final_score integer should change 30 seconds later.

Change-Id: Ibd963556c1b7ab115c34b8c7443dff87d915a230
Reviewed-on: https://gerrit.instructure.com/47751
Tested-by: Jenkins
Reviewed-by: Brian Finney <6d3e3f1a68388efca72d0ac9c9ecbc1039d2a9c2@instructure.com>
QA-Review: Amber Taniuchi <ef4bfd1e6d278f6bc7d4a478f02be2cb9581a0a5@instructure.com>
Product-Review: Matt Fairbourn <5f353e1c97bb9cc046b9db20beca0b9392f6f1b2@instructure.com>

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