Delete the display all totals feature flag for good
Delete the display all totals feature flag for good

closes CNVS-35665

Test plan:
* make sure the Display Totals for "All Grading Periods" feature flag
is not visible anywhere, including for site admins

Change-Id: Ibfe582898d4340f5222f4ecee8580e4430391dc3
Reviewed-on: https://gerrit.instructure.com/105117
Tested-by: Jenkins
Reviewed-by: Spencer Olson <7cc0890d6f1f70810a023e7173eca5724d6c8e49@instructure.com>
Product-Review: Neil Gupta <cc4fec8a34766005dd45d48be045c08d736c11ed@instructure.com>
QA-Review: Neil Gupta <cc4fec8a34766005dd45d48be045c08d736c11ed@instructure.com>

sfu/canvas-lms,venturehive/canvas-lms,sfu/canvas-lms,venturehive/canvas-lms,venturehive/canvas-lms,sfu/canvas-lms,venturehive/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,djbender/canvas-lms,djbender/canvas-lms