fix(turbopack): Apply hygiene if mangling is disabled (#77815)

### What?

Apply the normal variable renamer when we are not going to apply minfiying var renamer.

### Why?

Var renamer should be applied at least once.

### How?

Closes PACK-4245

Author: kdy1

turbopack/crates/turbopack-ecmascript/src/minify.rs

@@ -16,7 +16,10 @@ use swc_core::{
         },
         minifier::option::{CompressOptions, ExtraOptions, MangleOptions, MinifyOptions},
         parser::{lexer::Lexer, Parser, StringInput, Syntax},
-        transforms::base::fixer::paren_remover,
+        transforms::base::{
+            fixer::paren_remover,
+            hygiene::{self, hygiene_with_config},
+        },
     },
 };
 use tracing::{instrument, Level};
@@ -99,6 +102,13 @@ pub fn minify(path: &FileSystemPath, code: &Code, source_maps: bool, mangle: boo
                     },
                 );
 
+                if !mangle {
+                    program.mutate(hygiene_with_config(hygiene::Config {
+                        top_level_mark,
+                        ..Default::default()
+                    }));
+                }
+
                 Ok(program.apply(ecma::transforms::base::fixer::fixer(Some(
                     &comments as &dyn Comments,
                 ))))