refactor: simplify rampsUnifiedBuyV2 feature flag to single selector … #80

Job	Run time
Expo dev build (main-dev) / prepare	3m 28s
Expo dev build (main-dev) / update-build-version	0s
Expo dev build (main-dev) / Setup Dependencies (android) / Setup Node Modules (android)	4m 24s
Expo dev build (main-dev) / Setup Dependencies (ios) / Setup Node Modules (ios)	4m 46s
Expo dev build (main-dev) / build (android)	6m 8s
Expo dev build (main-dev) / build (ios)	5m 59s
	24m 45s

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