languages: Fix string override to match just string_fragment part of template_string (#33997)

Closes #33703

`template_string` consists of `template_substitution` and
`string_fragment` chunks. `template_substitution` should not be
considered a string.

```ts
const variable = `this is a string_fragment but ${this.is.template_substitution}`;
```

Release Notes:

- Fixed auto-complete not showing on typing `.` character in template
literal string in JavaScript and TypeScript files.

crates/languages/src/javascript/overrides.scm

@@ -1,9 +1,8 @@
 (comment) @comment.inclusive
 
-[
+(string) @string
-  (string)
+
-  (template_string)
+(template_string (string_fragment) @string)
-] @string
 
 (jsx_element) @element
 

crates/languages/src/tsx/overrides.scm

@@ -1,9 +1,8 @@
 (comment) @comment.inclusive
 
-[
+(string) @string
-  (string)
+
-  (template_string)
+(template_string (string_fragment) @string)
-] @string
 
 (jsx_element) @element
 

crates/languages/src/typescript/overrides.scm

@@ -1,6 +1,9 @@
 (comment) @comment.inclusive
+
 (string) @string
 
+(template_string (string_fragment) @string)
+
 (_ value: (call_expression
   function: (identifier) @function_name_before_type_arguments
   type_arguments: (type_arguments)))