[lib] Use getMessageForException instead of e.message in DM related code

Summary:
Use getMessageForException instead of e.message in DM related code in order to avoid bugs when throwing primitives.
Depends on D13757

Test Plan: 1. Run flow checks, run the app, verify that nothing crashes.

Reviewers: kamil, tomek, ashoat

Reviewed By: ashoat

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D13761