bug: Members who do not participate in Thread still receive notifications from Thread

[vihan85]

Describe the bug

Issue 1:

Step 1: The channel is called "channelTest" and has 3 members
Step 2: Member 1 creates a thread, the thread includes two users: Member 1 and Member 2.
Step 3: Member 1 and Member 2 chat in the thread

Expected behavior:
Members should only receive notifications and sort channel in channel list when there is a message from the main chat channel or the threads they are participating in.

Issue 2: Currently, there is no easy way to get the unread thread count within a message. This makes it difficult for users to identify which threads have unread messages and navigate to them. As a result, important conversations may be missed, leading to user frustration.

Expected behavior:
Show unread thread count from each thread the same Google chat

Package version

"stream-chat": "^8.51.0"
"@stream-io/stream-chat-css": "^5.6.1"
"stream-chat-react": "^12.8.2",