[lib] Validate DM operations

Summary:
Add an explicit validation with some logs.

https://linear.app/comm/issue/ENG-9190/alternative-solution-update-canbeprocessed-functions

Depends on D13464

Test Plan:
Clicked through the app and verified that e.g. sending text messages, reacting, and creating sidebars work.
Created some invalid operations from code and checked if it is discarded.

Reviewers: kamil, will

Reviewed By: kamil

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D13483