Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/49306
## Motivation
Modernising the RN codebase to allow for modern Flow tooling to process it.
## This diff
- Migrates `Libraries/Utilities/Platform.*.js` to use the export syntax.
- Updates deep-imports of these files to use `.default`
- Updates jest mocks
- Updates the current iteration of API snapshots (intended).
Changelog:
[General][Breaking] - Deep imports to `Libraries/Utilities/Platform` with `require` syntax needs to be appended with '.default'.
Reviewed By: huntie
Differential Revision: D69404025
fbshipit-source-id: f21501ca5b7e8e6a9e3e501781ed36e7d2bfd4a4
Iwo Plaza
d98116aa44