[native] [7/40] RN 0.70: Get rid of Flipper

Summary:
I was seeing build issues with the NotificationServiceExtension on iOS release builds until I disabled Flipper.

Flipper has always been a pain with builds and build times, and has always kind of sucked as a debugging tool. Instead, a later diff in this stack will introduce expo-dev-client, which has the ability to do JS debugging with Hermes.

Depends on D5900

Test Plan: Tested along with whole stack: test plan

Reviewers: tomek, bartek, jon!

Subscribers: atul

Differential Revision: https://phab.comm.dev/D5901