[React-Native]: v7

[krystofwoldrich]

Description

Goals

• Upgrade to JS v9
• Upgrade to Sentry Android v8 chore(deps): Bump Android SDK to v8.3.0 #4490
• Drop deprecated RN SDK APIs

Success Criteria

• The same as JS v9 was small major compared to JS v8, the same should be RN SDK v6 to v7.
  • Therefore only small percentage of users are expected to stay on the last version of RN SDK v6

[krystofwoldrich]

I've moved the deadline by a month (rough estimation) due to ongoing work on RN TTID/TTFD and the upcoming work on the Lynx SDK.