re-enable ember tests on jenkins

closes CNVS-10410

Change-Id: I1584f5ba7025f7a9f5bcb42edcd2adda99058734
Reviewed-on: https://gerrit.instructure.com/28482
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Bryan Madsen <bryan@instructure.com>
Reviewed-by: Bryan Madsen <bryan@instructure.com>
QA-Review: Bryan Madsen <bryan@instructure.com>