[native/sqlite] add IF NOT EXISTS constraint to migrations

Summary:
More context in this linear task with bug description.

This diff allows running all migration multiple times without crashing.

Test Plan:

1. This reproduce plan
2. Comment this line and reload app twice (without logout to check if this works on the same database instance)

Reviewers: tomek, jon, atul, marcin

Reviewed By: tomek, marcin

Subscribers: max, ashoat, atul, abosh

Differential Revision: https://phab.comm.dev/D5290