Sync error if course attempts to move or delete a shared question

[SethPoulsen]

revolves part of #9397

[github-actions]

All images

Image	Platform	Old Size	New Size	Change
prairielearn/executor:e55f570241d2f3ec959fb101f86d7d331c8ca231	null	1187.93 MB	1187.77 MB	-0.01%
prairielearn/prairielearn:e55f570241d2f3ec959fb101f86d7d331c8ca231	linux/amd64	1187.91 MB	1187.77 MB	-0.01%

[codecov]

Codecov Report

Attention: Patch coverage is 61.76471% with 13 lines in your changes are missing coverage. Please review.

Project coverage is 66.99%. Comparing base (22ab7c4) to head (e55f570).

Files	Patch %	Lines
apps/prairielearn/src/sync/syncFromDisk.ts	59.37%	13 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9797      +/-   ##
==========================================
- Coverage   67.01%   66.99%   -0.03%     
==========================================
  Files         458      458              
  Lines       71353    71387      +34     
  Branches     5720     5719       -1     
==========================================
+ Hits        47820    47828       +8     
- Misses      23104    23130      +26     
  Partials      429      429              

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