Make enableEmoji into a Markdown/Goldmark only feature

[bep]

This is a breaking change for some, but I suspect few. The current implementation have a few issues, mostly due to the current implementation doing very simple search and replace, which does not detect code blocks etc. where it does not make sense to emojify the content.

Instead of spending lots of time fixing this, we will add the Goldmark extension which handles this for us. But that will not work with Asciidoc, plain HTML etc.

See #7332
See #7913
See #11587

[github-actions]

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