Andrei Prigorshnev 7df40fc905
DEV: do not fabricate a notification when fabricating a chat_mention (#20636)
This is just a little clean-up in tests. In the past, when creating a `chat_mention` 
record, we always created a related notification. Starting from fa543cda 
notifications and chat_mentions are fully decoupled from each other. So if we're 
testing just chat mentions there is no need to fabricate notifications for them.
2023-03-10 18:32:33 +04:00
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