refactor(ast_tools/raw_transfer): simplify generating struct deserializer preamble (#14337)

Pure refactor. Now that output is going through minifier, we can rely on it to conflate a series of variable declarations. No need to build a single variable declaration with multiple declarators any more.

Author: overlookmotel

tasks/ast_tools/src/generators/raw_transfer.rs

@@ -296,12 +296,7 @@ fn generate_struct(
                 }
             } else {
                 let value = if generator.dependent_field_names.contains(&field_name) {
-                    if preamble_str.is_empty() {
-                        preamble_str.push_str("const ");
-                    } else {
-                        preamble_str.push_str(",\n");
-                    }
-                    write_it!(preamble_str, "{field_name} = {value}");
+                    write_it!(preamble_str, "const {field_name} = {value};\n");
                     &field_name
                 } else {
                     &value
@@ -320,10 +315,6 @@ fn generate_struct(
             }
         }
 
-        if !preamble_str.is_empty() {
-            preamble_str.push(';');
-        }
-
         for preamble_part in generator.preamble {
             preamble_str.push_str(preamble_part.trim());
         }