fix: oldest first next unread not correctly enabling and jumping to new comments

What does this PR do?

This makes it so that new comments coming in for oldest first sort also use viewNewCount so that they will enable Next unread button and also correctly scroll to the next unread comment if it's a new comment.

What changes to the GraphQL/Database Schema does this PR introduce?

none

Does this PR introduce any new environment variables or feature flags?

no

If any indexes were added, were they added to INDEXES.md?

n/a

How do I test this PR?

Add a new comment, logged in as a user on one stream. Have another stream open and sorted by oldest first and all comments marked as seen. See that Next unread button enables itself. Press the button. See that you go to the new comment. Also test when there are some other comments before the Next unread in the stream.

How do we deploy this PR?

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