fix: remove replies usage entirely

[isekovanic]

🎯 Goal

The purpose of this PR is to clean up all remnants of the old thread state usage in preparation for the next major.

We now use messagePaginator for the purposes of relying on pagination and list hydration and so we do not need to do it twice.

LLC PR: GetStream/stream-chat-js#1804

🛠 Implementation details

Provide a description of the implementation

🎨 UI Changes

Add relevant screenshots

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