add mocks for the 'Find' modal in storybook
add mocks for the 'Find' modal in storybook

refs OUT-4016
flag=improved_outcomes_management

test-plan:
- run storybook
> yarn storybook
- go to Outcomes > FindOutcomeModal
- verify there are 101 groups within Account Standards
when isCourse is true
- verify there are 100 groups when isCourse is false
- verify that when `includeGlobalRootGroup` is true and
isCourse is false, you see a 'State Standards' folder
- verify you don't see this folder when isCourse is true
(we don't show the State Standards folder when viewing
within a course)
- visit the 'Query' tab
  - verify changing the childGroupsCount for one of the root
account groups updates the count within the
'Account Standards' folder

Change-Id: I4203df60c8b458e8a061573d2e6597f560bceeb4
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/258092
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
Reviewed-by: Michael Brewer-Davis <785693f4c81267e5b88c0f98d39b56a39a2b6910@instructure.com>
Reviewed-by: Brian Watson <4411c2aac809443ec63e2dd517de0f2dbc7408c6@instructure.com>
QA-Review: Brian Watson <4411c2aac809443ec63e2dd517de0f2dbc7408c6@instructure.com>
Product-Review: Michael Brewer-Davis <785693f4c81267e5b88c0f98d39b56a39a2b6910@instructure.com>

sfu/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,instructure/canvas-lms