[native] make user profile accessible from MessageReactionsModal

Summary:
This diff makes the renderItem inside of MessageReactionsModal into a touchable that will navigate to the user profile whenever onPress is triggered

Depends on D9389

Test Plan:
Please see the demo video below:

Reviewers: atul, inka

Reviewed By: atul

Subscribers: ashoat, tomek, wyilio

Differential Revision: https://phab.comm.dev/D9390