ci: make TestFlight external distribution configurable (#27683) #39

Job	Run time
Expo dev build (main-dev) / prepare	3m 26s
Expo dev build (main-dev) / update-build-version	0s
Expo dev build (main-dev) / Setup Dependencies (android) / Setup Node Modules (android)	5m 38s
Expo dev build (main-dev) / Setup Dependencies (ios) / Setup Node Modules (ios)	11m 21s
Expo dev build (main-dev) / build (ios)	19m 52s
Expo dev build (main-dev) / build (android)	16m 34s
	56m 51s

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