Extract Vue extension (#10486)

This PR extracts Vue support into an extension and removes the built-in
C# support from Zed.

Release Notes:

- Removed built-in support for Vue, in favor of making it available as
an extension. The Vue extension will be suggested for download when you
open a `.vue` file.

---------

Co-authored-by: Max <max@zed.dev>

crates/extensions_ui/src/extension_suggest.rs

@@ -61,6 +61,7 @@ const SUGGESTIONS_BY_EXTENSION_ID: &[(&str, &[&str])] = &[
     ("templ", &["templ"]),
     ("terraform", &["tf", "tfvars", "hcl"]),
     ("toml", &["Cargo.lock", "toml"]),
+    ("vue", &["vue"]),
     ("wgsl", &["wgsl"]),
     ("zig", &["zig"]),
 ];