Pass pairs of message data and raw message info to notif generation code

Summary: This differential modifies notif generation code to take pairs of message data and raw message info instead of message data alone to avoid issue of duplicated raw message info with different message id.

Test Plan: Ensure that those steps no longer introduce the bug.

Reviewers: tomek, kamil, ashoat

Reviewed By: ashoat

Differential Revision: https://phab.comm.dev/D13417