fix(lockfile): Fix directory resolution variant (#5551)

### Description

Fixes #5529

During the Rust migration I must've messed up the directory field name.
Double checked against
[`@pnpm/lockfile-types`](https://github.com/pnpm/pnpm/blob/main/lockfile/lockfile-types/src/index.ts#L86)
to make sure all of the fields are correct now.

`PackageResolution` should be an enum, but the fact that tarballs are an
untagged variant makes that tricky to communicate to `serde`. A struct
does enough for us.

### Testing Instructions

Added new unit test to make sure we don't lose any fields for the
various variants of the `resolution` field

---------

Co-authored-by: Chris Olszewski <Chris Olszewski>

crates/turborepo-lockfiles/src/pnpm/data.rs

@@ -80,7 +80,6 @@ pub struct Dependency {
 #[derive(Debug, Serialize, Deserialize, PartialEq, Eq, Clone)]
 #[serde(rename_all = "camelCase")]
 pub struct PackageSnapshot {
-    // can we make this flow?/is it necessary?
     resolution: PackageResolution,
     #[serde(skip_serializing_if = "Option::is_none")]
     id: Option<String>,
@@ -113,14 +112,21 @@ pub struct DependenciesMeta {
 
 #[derive(Debug, Serialize, Deserialize, PartialEq, Eq, Clone)]
 pub struct PackageResolution {
+    // Type field, cannot use serde(tag) due to tarball having an empty type field
+    // tarball -> none
+    // directory -> 'directory'
+    // git repository -> 'git'
     #[serde(rename = "type", skip_serializing_if = "Option::is_none")]
     type_field: Option<String>,
+    // Tarball fields
     #[serde(skip_serializing_if = "Option::is_none")]
     integrity: Option<String>,
     #[serde(skip_serializing_if = "Option::is_none")]
     tarball: Option<String>,
+    // Directory fields
     #[serde(skip_serializing_if = "Option::is_none")]
-    dir: Option<String>,
+    directory: Option<String>,
+    // Git repository fields
     #[serde(skip_serializing_if = "Option::is_none")]
     repo: Option<String>,
     #[serde(skip_serializing_if = "Option::is_none")]
@@ -792,4 +798,34 @@ mod tests {
             ],
         );
     }
+
+    #[test]
+    fn test_injected_package_round_trip() {
+        let original_contents = "a:
+  resolution:
+    type: directory,
+    directory: packages/ui,
+  name: ui
+  version: 0.0.0
+  dev: false
+b:
+  resolution:
+    integrity: deadbeef,
+    tarball: path/to/tarball.tar.gz,
+  name: tar
+  version: 0.0.0
+  dev: false
+c:
+  resolution:
+    repo: great-repo.git,
+    commit: greatcommit,
+  name: git
+  version: 0.0.0
+  dev: false
+";
+        let original_parsed: Map<String, PackageSnapshot> =
+            serde_yaml::from_str(original_contents).unwrap();
+        let contents = serde_yaml::to_string(&original_parsed).unwrap();
+        assert_eq!(original_contents, &contents);
+    }
 }