[native] Display error message when community creation fails
Summary:
We display an error message below the "Create Community" button when the community creation request fails.
We clear the error message when
- User changes name input
- User changes announcement setting
- User re-attempts community creation
Depends on D7979
Test Plan:
Looks as expected (killed keyserver to ensure requests failed):
Reviewers: ashoat, ginsu
Reviewed By: ashoat
Subscribers: tomek
Differential Revision: https://phab.comm.dev/D7980