[lib] update processDMOpsActionType action to return all ops

Summary:
This addresses https://phab.comm.dev/D13661#inline-77579.

I completely missed that comment because of other discussion in the diff, so addressing this now

Test Plan: Test thread creation, unread status and reply count

Reviewers: tomek, angelika

Reviewed By: tomek

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D13739