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[skip-stages=Flakey]

so we don't have to manually do it, especially with increasingly
complicated relative paths.

and stop manually requiring it in plugins, and also convert any other
require File.expand_path to require_relative

Change-Id: Ifc07149372fe09bcc146ac1b980feb3a9fd62865
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/276816

Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>
Reviewed-by: August Thornton <august@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>