invalid records should not hit sentry in course copy
invalid records should not hit sentry in course copy

closes FOO-1386
flag=none

TEST PLAN:
  1) course copy in a way producing an invalid course
  2) course migration should have error annotation still,
     but sentry doesn't get a report.

Change-Id: I56a51d6cb942e5713b35af95d9b60852565199f5
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/255710
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
Reviewed-by: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>
QA-Review: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>
Product-Review: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>

instructure/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,instructure/canvas-lms