Scope Tailwind in JS/TS to within string

In some situations outside JSX elements Tailwind will never
respond to a completion request, holding up the tsserver completions.

Only submit the request to Tailwind when we wouldn't get tsserver
completions anyway and don't submit to Tailwind when we know we won't
get Tailwind completions

Co-Authored-By: Kirill Bulatov <kirill@zed.dev>

crates/zed/src/languages/javascript/config.toml

@@ -13,6 +13,7 @@ brackets = [
     { start = "`", end = "`", close = true, newline = false, not_in = ["comment", "string"] },
     { start = "/*", end = " */", close = true, newline = false, not_in = ["comment", "string"] },
 ]
+scope_opt_in_language_servers = ["tailwindcss-language-server"]
 
 [overrides.element]
 line_comment = { remove = true }
@@ -20,3 +21,4 @@ block_comment = ["{/* ", " */}"]
 
 [overrides.string]
 word_characters = ["-"]
+opt_into_language_servers = ["tailwindcss-language-server"]