RN v0.69 upgrade

[gnprice]

The next round after #5344.

• Blog post: https://reactnative.dev/blog/2022/06/21/version-069
• More-detailed changelog: https://github.com/facebook/react-native/blob/main/CHANGELOG.md#v0690

[gnprice]

This release has some major headline changes that are optional -- so, potential opportunities, but shouldn't be obstacles to the upgrade:

• React 18
• More development on RN's "New Architecture"
• More development on Hermes

Other things highlighted in the blog post:

• Hermes is now bundled with RN. They flag that this may require some steps in the upgrade -- but I expect that's all covered by our usual systematic upgrade process.
• iOS min version bumped to 12.4. We currently have 12.1 but can cheerfully match that change.
• "React Native now uses the latest status bar API from Android 11", linking to facebook/react-native@50c8e97 .
• "Support for console.disableYellowBox has been dropped", linking to facebook/react-native@b633cc1 . We use that, but the reality is less alarming than the headline: there's a new API that subsumes it, so we need to migrate.

[gnprice]

Changes I notice in the full changelog:

• facebook/react-native@c1e9aa9 Deprecate the use of react-native/jest/preprocessor.js by external projects
  • We're using this, in our jest.config.js.
• facebook/react-native@b2517c3 Automatic update of RCT-Folly
  • This sounds possibly related to some CocoaPods glitches we've run into, like https://chat.zulip.org/#narrow/stream/243-mobile-team/topic/Podfile.2Elock.20change.3A.20FBReactNativeSpec/near/1327187 and/or https://github.com/zulip/zulip-mobile/blob/main/docs/howto/build-run.md#cocoapods-could-not-find-compatible-versions-for-pod . Though it doesn't sound like a solid match for either of those.

And that's all I see.