testing slack channel override
testing slack channel override

refs DE-1351
flag=none

TEST PLAN:
  Build

Change-Id: I1c90fa22f7f64e875157bd3e589b16f7079e6274
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/302044
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
Reviewed-by: Andrea Cirulli <b4e55ef5ee4bae8ad31f7c81009bfc0af1714a1f@instructure.com>
QA-Review: Bobby Buten <5d364bfede2bfc09ec31d2e6ed3a4d111d37200d@instructure.com>
Product-Review: Bobby Buten <5d364bfede2bfc09ec31d2e6ed3a4d111d37200d@instructure.com>
Build-Review: Bobby Buten <5d364bfede2bfc09ec31d2e6ed3a4d111d37200d@instructure.com>

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