This removes the ill-fated React Gradebook.
This commit is effectively a revert of
b9534edd64
closes CNVS-32394
test plan:
* ensure 'Gradebook Performance' is no longer available
* ensure other Gradebooks are still functional
* Default Gradebook basic happy path
* Individual Gradebook (SRGB) basic happy path
Change-Id: Ie71ab4dfb17f494c2a7c17a27cd551a84e7efb96
Reviewed-on: https://gerrit.instructure.com/94005
Tested-by: Jenkins
Reviewed-by: Spencer Olson <solson@instructure.com>
QA-Review: KC Naegle <knaegle@instructure.com>
Product-Review: Christi Wruck