Communication: Push notifications for mentions not working as expected

[anian03]

Describe the bug

There are two issues regarding push notifications (sent to iOS/Android) for user mentions:

• Users are notified about mentions in (public and private) channels that they are not part of, even though they should not be notified.
• Users are not notified about being mentioned in a reply to a thread they are not part of, even though they should be notified.

To Reproduce

Issue 1:

1. Create a public or private channel without adding anyone
2. Send a message to the channel with a mention for a user that is not in the channel
3. That user will receive a push notification

Issue 2:

1. Create a message in any channel
2. Reply to it with a mention for a user that has not replied
3. That user is not notified

Expected behavior

Issue 1: Users should only be notified about mentions in channels that they are a part of.

Issue 2: Users should be notified if they are mentioned in a reply

Screenshots

No response

Which version of Artemis are you seeing the problem on?

7.10.2

What browsers are you seeing the problem on?

Other (specify in "Additional context")

Additional context

No response

Relevant log output