remove hidden feature flag
remove hidden feature flag

fixes CNVS-25990

Test Plan:
- Turn on user search feature flag
- Notice it isn't hidden

Change-Id: I8f2372201de589f138ef388d6133eed9aafae42a
Reviewed-on: https://gerrit.instructure.com/85267
Reviewed-by: Joel Hough <4816dabf8db1bc6cac35b3a24cab2ff844b5b0c7@instructure.com>
Tested-by: Jenkins
Product-Review: Steven Burnett <a0b450117c5d20a22d5c4d52bb8ae13adee003d8@instructure.com>
QA-Review: Steven Burnett <a0b450117c5d20a22d5c4d52bb8ae13adee003d8@instructure.com>

matematikk-mooc/canvas-lms,SwinburneOnline/canvas-lms,HotChalk/canvas-lms,SwinburneOnline/canvas-lms,matematikk-mooc/canvas-lms,SwinburneOnline/canvas-lms,grahamb/canvas-lms,sfu/canvas-lms,HotChalk/canvas-lms,grahamb/canvas-lms,dgynn/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,grahamb/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,djbender/canvas-lms,HotChalk/canvas-lms,djbender/canvas-lms,djbender/canvas-lms,fronteerio/canvas-lms,SwinburneOnline/canvas-lms,grahamb/canvas-lms,sfu/canvas-lms,venturehive/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,fronteerio/canvas-lms,dgynn/canvas-lms,instructure/canvas-lms,HotChalk/canvas-lms,venturehive/canvas-lms,instructure/canvas-lms,matematikk-mooc/canvas-lms,fronteerio/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,venturehive/canvas-lms,dgynn/canvas-lms,matematikk-mooc/canvas-lms,venturehive/canvas-lms,fronteerio/canvas-lms,dgynn/canvas-lms,grahamb/canvas-lms