Prevents in-request updating of all in progress QSes on Quiz#update
Prevents in-request updating of all in progress QSes on Quiz#update

Previously, when changing the quiz time limit, all in progress quiz
submission attempts were updated synchronously or the request would
fail.  In July, a class with ~5k students was updated repeatedly causing
6 minute transactions.  This sacrifices synchronous QS updates to make
sure our request completes.

Closes CNVS-22115

Test Plan:
  - Create quiz with time limit set to 10 minutes
  - Start quiz with student
  - Edit the quiz as the teacher and set time limit to 12 minutes
  - Make sure the student time adjusts
  - Edit the time limit to 4 minutes
  - Make sure the student time is changed (soonish, not immediately)

Change-Id: I931f3beb5bee3bb39c39a0f0353a4c0a9c678ed3
Reviewed-on: https://gerrit.instructure.com/64548
Tested-by: Jenkins
Reviewed-by: John Corrigan <3d73713d0cc718326e4fd7c06c64e067ad6e2270@instructure.com>
QA-Review: Michael Hargiss <59e3fde81b8d9a4f5e0cc016a3c2695591912604@instructure.com>
Product-Review: Brian Finney <6d3e3f1a68388efca72d0ac9c9ecbc1039d2a9c2@instructure.com>

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