emmet: Enable in Vue.js files (#35599)

Resolves part of #34337

Actually I need also to add:

```
"languages": {
    "Vue.js": {
      "language_servers": [
        "vue-language-server",
        "emmet-language-server",
        "..."
      ]
    }
  },
```

not sure how to resolve fully, happy to continue only little guidance
needed.

Release Notes:

- allow emmet in Vue.js files

---------

Co-authored-by: Marshall Bowers <git@maxdeviant.com>

extensions/emmet/extension.toml

@@ -9,7 +9,7 @@ repository = "https://github.com/zed-industries/zed"
 [language_servers.emmet-language-server]
 name = "Emmet Language Server"
 language = "HTML"
-languages = ["HTML", "PHP", "ERB", "HTML/ERB", "JavaScript", "TSX", "CSS", "HEEX", "Elixir"]
+languages = ["HTML", "PHP", "ERB", "HTML/ERB", "JavaScript", "TSX", "CSS", "HEEX", "Elixir", "Vue.js"]
 
 [language_servers.emmet-language-server.language_ids]
 "HTML" = "html"
@@ -21,3 +21,4 @@ languages = ["HTML", "PHP", "ERB", "HTML/ERB", "JavaScript", "TSX", "CSS", "HEEX
 "CSS" = "css"
 "HEEX" = "heex"
 "Elixir" = "heex"
+"Vue.js" = "vue"