Microsoft added a Turn off notifications option in Teams conversations.
How to Turn off notifications?
You can Turn off the notifications in Teams conversations from Microsoft
Teams conversation select More options ^…^ Turn off notifications.

What happens when you Turn off notifications in Teams conversations?
If you are in a meeting /you feel conversations are distracting, then
you can use this. Once you Turn off these notifications then you will
not get notified even when users reply in that conversation, but if
someone is @ mentioning/reacting for your message then you will receive
notifications.
@Mention:
For example, Christa Geller is @mentioning MOD Administrator in his
conversation, so the MOD Administrator receives the notification, even
he enabled these options. Refer the below image

Reaction:
If someone is reacting to your message, then it shows notifications in
your teams
The below image shows that Allie Bellew reacts for his conversation, so
MOD Administrator receives a notification, even he enabled these
options.

Turn on notifications:
You can Turn on notifications if required, from Conversation select More
option ^…^ Turn on notifications.









