[native] [3/40] RN 0.70: iOS stuff
Summary:
These are the non-Podfile iOS changes from React Native Upgrade Helper. The project.pbxproj parts had to be "reverse engineered" from the patch there and then manually reapplied using Xcode... since those are pretty complicated, I'll try to describe inline.
Depends on D5896
Test Plan: Tested along with whole stack: test plan
Reviewers: tomek, bartek
Subscribers: atul
Differential Revision: https://phab.comm.dev/D5897