[lib] Update messageStore.messages with msgStoreOps for remaining action types

Summary:
These are the last actions in reduceMessageStore that need to be modified so we can remove assertMessageStoreMessagesAreEqual and solely use the "ops approach" to update messageStore.messages in redux.

The two remaining instances of assertMessageStoreMessagesAreEqual are in mergeNewMessages and will be addressed in the next diff.

Depends on D4330

Test Plan: This should be a straightforward refactor given we've had assertMessageStoreMessagesAreEqual in place for some time now.

Reviewers: def-au1t, palys-swm, yayabosh

Reviewed By: palys-swm

Subscribers: ashoat, Adrian

Differential Revision: https://phab.comm.dev/D4331