Remove RCTPushNotificationManager from umbrella header (#52306)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/52306

The RCTPushNotificationManager is deprecated and not part of the prebuilds as it is optional.
We mistakenly added it to the umbrella header and nightlies do not work with prebuilds.

This change removes the header ad should fix the build.

## Changelog:
[Internal] -

Reviewed By: philIip

Differential Revision: D77395754

fbshipit-source-id: 66371650dc56f5be16a00319d9e4a1078a7b68bd