build: source .xcode.env in the RN bundle build phase

The Bundle React Native code and images phase resolved node inline with
command -v, bypassing with-environment.sh, so the .xcode.env.local
written by ci_post_clone.sh was never sourced and Xcode Cloud archives
failed with "Can't find the 'node' binary". Route the phase through
React Native's with-environment.sh wrapper (the current template shape)
so .xcode.env and .xcode.env.local are honored. REACT_NATIVE_PATH is
already set on the project by react_native_post_install.

Version bump: v13.2.1

Version bump: v13.2.1-rc1

Version bump: v13.2.0

Version bump: v13.2.0-rc1

Version bump: v13.2.0-beta1

Version bump: v13.2.0-alpha1

Version bump: v13.1.3

Version bump: v13.1.2

ios: remove sponsor buttons