chore(core): Bump sample app to React Native 0.84.1 #12776

Job	Run time
Ready-to-merge gate / Missing "ready-to-merge" label	2s
diff_check / diff_check	11s
detect-changes / Detect file changes	8s
Build new android dev	11m 56s
Build new ios production no-frameworks	7m 10s
Build new ios dev no-frameworks	7m 29s
Build new android production	13m 14s
Build legacy macos production	5m 51s
Build legacy macos dev	5m 40s
Test ios production REV2	6m 6s
Test android production REV2	5m 55s
	1h 3m 42s

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