[0.73] Cherry-pick "Implement privacy manifest aggregation"

[aleqsio]

Target Branch(es)

0.73

Link to commit or PR to be picked

facebook/react-native@61f584c

Description

Privacy manifests are just now starting to be enforced, and apps that do not have a manually set privacy info file will be rejected.

This change enables aggregation of package level privacy info files, so it might make sense to ship this to prior version (0.73 in this pick request)