Mentions do not include @all and @here

Description:

The list of mentions within channels do not include messages using @all and @here.

Steps to reproduce:

1. Make sure you have two users who are joined to a channel.
2. Log in with one user who has the permission to use @all.
3. Write a message highlighting all users in the channel using @all.
4. Log in with the other user.
5. Open the list of mentions for the channel.

Expected behavior:

The message from step 2 is included.

Actual behavior:

The message from step 2 is not included.

Server Setup Information:

• Version of Rocket.Chat Server: 6.4.4
• Deployment Method: Docker
• Number of Running Instances: 1
• MongoDB Version: 6.0.11

Client Setup Information

Problem should be client agnostic, but tested with:

• Browser Version:
  • Firefox 119.0 (64-bit)
  • Chromium Version 119.0.6045.59 (Offizieller Build) Arch Linux (64-Bit)
• Operating System: Arch Linux

Additional context

It is possible to argue that the "Mentions" should only list all messages in which the user has been explicitely highlighted. However, I doubt that this is the main use case for "Mentions". At least I would prefer it to list all messages that highlighted me in some way, i.e. all messages that I receive notifications for.

Custom highlights are also not listed in "Mentions".

The mobile app behaves in the same way as the browser version.

Reproduce the issue by posting an @all or @here message in a channel, then open that channel's Mentions list as another user. Trace the code that retrieves and displays channel mentions; done when messages containing these mentions appear in the list, including in the browser and mobile-client behavior described.