Remove support for disable_jump_reply user setting (PR #7359)

https://meta.discourse.org/t/new-posts-count-in-browser-tabs-broken/112864/20?u=david

GitHub

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Merging this in for now, we can ship a component later

This pull request has been mentioned on Discourse Meta. There might be relevant details there:

https://meta.discourse.org/t/how-to-stop-discourse-scrolling-down-to-my-reply-after-replying/134689/6