Add header to Reports table
Add header to Reports table

fixes FOO-2816

test plan: the header appears

flag=none

Change-Id: Ifea743876b297bbf9d0aeb07777e9980e8363a6c
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/291337
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
Reviewed-by: Charley Kline <05950d7e90ba5e3da323378368c22b3ffaaf6647@instructure.com>
QA-Review: Charley Kline <05950d7e90ba5e3da323378368c22b3ffaaf6647@instructure.com>
Product-Review: Jesse Poulos <0a3f73d5b21621dbbacf36ae20620a7eb669a89e@instructure.com>

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