feat(core): Support SENTRY_ENVIRONMENT in bare React Native builds #7147

Job	Run time
Ready-to-merge gate / Missing "ready-to-merge" label	3s
diff_check / diff_check	8s
Build ios production no-frameworks	6m 34s
Build android production no-frameworks	14m 44s
Build web	4m 38s
Build ios dev dynamic-frameworks	6m 29s
Build ios dev no-frameworks	6m 8s
Build android dev no-frameworks	13m 6s
Build ios production dynamic-frameworks	7m 4s
	58m 54s

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