[native] make bottomsheet snap point dynamic

Summary:
This diff replaces the hardcoded snap point I set earlier with a snap point that is based off the height of the bottomsheet container. With this new dynamic snap point, the bottom sheet will always update and change it's snap point whenever the height of the container changes (for example when we add or remove a button on the user profile component)

Depends on D9273

Test Plan:
Please see the demo videos below

Reviewers: atul, inka

Reviewed By: atul

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D9274