Call textMessageCreationSideEffectsFunc after sending DM text message
Summary: This differential adds user to thick sidebar when another user mentions them in a message
Test Plan:
- Create thick sidebar
- Send message mentioning a user
- Ensure that they are added to the sidebar
Reviewers: tomek, kamil, inka, ashoat
Reviewed By: tomek, kamil, ashoat
Subscribers: ashoat
Differential Revision: https://phab.comm.dev/D13334