Autocomplete still using Raw Templates

We are planning to replace the JQuery-based autocomplete implementation in the near future. But for now, in order to unblock the removal of the raw-handlebars compilation pipeline, we’re replacing the autocomplete .hbr templates with vanilla JS.

Here’s the core PR:

https://github.com/discourse/discourse/pull/31957

and similar ones for some third-party plugins:

Admittedly it would’ve been much better if we’d deprecated these things a few months ago. But, I’ve searched all-the-* and haven’t found any other people who were depending on this, so we’re planning to push forward with the removal in core next week.

https://github.com/discourse/discourse/pull/32081

If anyone else runs into any problems, please feel free to post here and we’ll be happy to help.