[MulitSelect, SingleSelect] Move `showOpenerLabelAsText` out of sharedProps #4744

Job	Run time
Check for .changeset entries for all changed files (ubuntu-latest, 20.x)	55s
Prime node_modules cache for primary configuration (ubuntu-latest, 20.x)	13s
Publish npm snapshot (ubuntu-latest, 20.x)	13s
Check build sizes (ubuntu-latest, 20.x)	1m 29s
Test / Test (ubuntu-latest, 20.x, 1/2)	1m 18s
Test / Test (ubuntu-latest, 20.x, 2/2)	1m 10s
Lint / Lint (ubuntu-latest, 20.x)	1m 0s
	6m 18s

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