Update RawOutput API (vercel#8075)

### Description

Update `RawOutput` API

Updated API suggested by @sokra in review on #65223:

vercel/next.js#65223 (comment)

Without this change, I don't think this API is useful. This makes the API very similar to `VirtualOutputAsset`.

### Testing Instructions

Tested with vercel/next.js#65300

Closes PACK-3034

crates/turbopack-core/src/raw_output.rs

@@ -1,4 +1,5 @@
 use turbo_tasks::Vc;
+use turbo_tasks_fs::FileSystemPath;
 
 use crate::{
     asset::{Asset, AssetContent},
@@ -11,14 +12,15 @@ use crate::{
 /// This module has no references to other modules.
 #[turbo_tasks::value]
 pub struct RawOutput {
+    path: Vc<FileSystemPath>,
     source: Vc<Box<dyn Source>>,
 }
 
 #[turbo_tasks::value_impl]
 impl OutputAsset for RawOutput {
     #[turbo_tasks::function]
     fn ident(&self) -> Vc<AssetIdent> {
-        self.source.ident()
+        AssetIdent::from_path(self.path)
     }
 }
 
@@ -33,7 +35,7 @@ impl Asset for RawOutput {
 #[turbo_tasks::value_impl]
 impl RawOutput {
     #[turbo_tasks::function]
-    pub fn new(source: Vc<Box<dyn Source>>) -> Vc<RawOutput> {
-        RawOutput { source }.cell()
+    pub fn new(path: Vc<FileSystemPath>, source: Vc<Box<dyn Source>>) -> Vc<RawOutput> {
+        RawOutput { path, source }.cell()
     }
 }