Move request for notifications permissions to `HomeReadyScreen` (#3977)
* cleanup the current logic
* add statsig logs
* implement requests for permissions where needed
* oops
* let `addPushTokenListener` handle the token registration
* place new log event type with the other `notifications` type
* place registration next to handler
* more organization
* only call `gate()` if permission is not yet granted
* be more specific to prevent gate pollution
* nit
* make `token` non-optional in `registerToken`
* remove `prevDid`, move `registerPushToken` into `useEffect`
* keep it outside actually
* nit