[MLv2] Move template tag extraction into CLJC for use from BE (#29526)

This supports both parsing out the tags and constructing the template tags map, with `card-id` and all.

This is not quite a FE no-op because the humanization of text is slightly different between `metabase.util.humanization` and the JS humanization library.

This improves JS<->CLJS conversion to handle UUIDs and be smarter about enums, both of which were needed to handle converting template tag maps.

Extracted a `js=` test helper to `metabase.test.util.js/=` since many tests need to compare JS objects, which are not JS `==` to each other.