Upgrade RN fork to latest

[roryabraham]

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Problem

A recent commit in the react-native upstream introduced Fabric support for modals. We don't have that code in our fork yet.

Solution

Two parts:

1. Upgrade and republish our fork (I will do this)
2. Then upgrade E/App to the new version of the fork (most likely this will shadow 0.70.4, released two days ago) (I will likely make this part external)

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[roryabraham]

Ran into a snag where this commit has not been included in any upstream release yet

[roryabraham]

Going to just manually perform that commit in the Expensify-0.70.4-alpha branch, so that we can get it included in the release without me trying to build off a non-stable release

[roryabraham]

Fork has been upgraded, and I published @expensify/react-native@0.70.4-alpha.1, that shadows the upstream 0.70.4. I also added in this commit manually so that we can benefit from that change which hasn't been included in any upstream releases yet.

To clarify, E/App is currently using @expensify/react-native@0.70.5, which (confusingly) shadowed the upstream 0.70.1. Going forward, I'm going to use -alpha.X release suffixes so that our fork versions always shadow the upstream more intuitively.

[roryabraham]

Upgrade helper diff: https://react-native-community.github.io/upgrade-helper/?from=0.70.1&to=0.70.4

[AndrewGable]

PR In review