fix: cache structure for useorgunitnames #9641

Job	Run time
setup-matrix	3s
install	26s
flow	49s
unit-tests	29s
lint	1m 5s
build	2m 32s
instance-version	3s
cypress-dev (1, cypress/e2e/AllAccessibleRecordsPage/AllAccessibleRecordsPage.feature, cypress/e2...	6m 20s
cypress-dev (2, cypress/e2e/EnrollmentAddEventPage/EnrollmentAddEventPageForm/EnrollmentAddEventP...	8m 43s
cypress-dev (3, cypress/e2e/EnrollmentAddEventPage/EnrollmentAddEventPageNavigation/EnrollmentAdd...	9m 23s
cypress-dev (4, cypress/e2e/EnrollmentAddEventPage/ProgramStageSelector/ProgramStageSelector.feat...	9m 51s
cypress-dev (5, cypress/e2e/EnrollmentEditEventPage/EnrollmentEditEventPageForm/EnrollmentEditEve...	12m 18s
release	49s
	52m 51s

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