Fix RCTPushNotification podspec to work with prebuilds (#52531)

Summary:
This change tries to use the prebuilds we build in CI i other iOS jobs to speed-up the iOS CI

bypass-github-export-checks

## Changelog:
[Internal] -

Pull Request resolved: https://github.com/facebook/react-native/pull/52531

Test Plan:
Build rntester using prebuilds:

```
# after downloading the prebuilds from CI and unzipping them
export HERMES_ENGINE_TARBALL_PATH=~/Downloads/hermes-ios-Debug.tar.gz
export RCT_USE_LOCAL_RN_DEP=~/Downloads/reactnative-dependencies-debug.tar.gz
export RCT_TESTONLY_RNCORE_TARBALL_PATH=~/Downloads/React.xcframework.tar.gz

USE_FRAMEWORKS=dynamic bundle exec pod install
open RNTesterPods.xcworkspace
```
And then build from Xcode.

Reviewed By: rshest

Differential Revision: D78158734

Pulled By: cipolleschi

fbshipit-source-id: 43cbb66bd44fa621292b69de0dadde5ed20c4574