tailwind: Add HTML+ERB to the list of supported languages (#36797)

Hi! As part of https://github.com/zed-extensions/ruby/issues/162 we
would like to rename HTML/ERB to HTML+ERB since it is more syntactically
correct to treat such language as ERB on top of HTML rather than HTML or
ERB.

To keep the user experience intact, we outlined the prerequisites in the
linked issue. This is the first PR that adds the HTML+ERB language name
to the list of enabled languages for the Emmet extension. We will do the
same for the Tailwind configuration in the Zed codebase. Once the new
versions of Emmet and Zed are released, we will merge the pull request
in the Ruby extension repository and release the updated version. After
that, we will remove the old HTML/ERB and YAML/ERB languages. Let me
know if that sounds good. Thanks!

Release Notes:

- N/A

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

crates/languages/src/lib.rs

@@ -296,6 +296,7 @@ pub fn init(languages: Arc<LanguageRegistry>, node: NodeRuntime, cx: &mut App) {
         "Astro",
         "CSS",
         "ERB",
+        "HTML+ERB",
         "HTML/ERB",
         "HEEX",
         "HTML",

crates/languages/src/tailwind.rs

@@ -184,6 +184,7 @@ impl LspAdapter for TailwindLspAdapter {
             (LanguageName::new("Elixir"), "phoenix-heex".to_string()),
             (LanguageName::new("HEEX"), "phoenix-heex".to_string()),
             (LanguageName::new("ERB"), "erb".to_string()),
+            (LanguageName::new("HTML+ERB"), "erb".to_string()),
             (LanguageName::new("HTML/ERB"), "erb".to_string()),
             (LanguageName::new("PHP"), "php".to_string()),
             (LanguageName::new("Vue.js"), "vue".to_string()),