feat(ls): add dependents to json output (#10367)

### Description

Add dependents to the JSON output of `ls`

### Testing Instructions

```
[0 olszewski@macbookpro] /Users/olszewski/code/vercel/turborepo $ turbo_dev ls @turbo/types --output=json   
 WARNING  No locally installed `turbo` found. Using version: 2.5.1-canary.1.
turbo 2.5.1-canary.1

{
  "packages": [
    {
      "name": "@turbo/types",
      "path": "packages/turbo-types",
      "tasks": {
        "count": 5,
        "items": [
          {
            "name": "build",
            "command": "tsc && pnpm generate-schema"
          },
          {
            "name": "copy-schema",
            "command": "cp schemas/schema.json ../turbo/schema.json"
          },
          {
            "name": "generate-schema",
            "command": "tsx scripts/generate-schema.ts"
          },
          {
            "name": "lint",
            "command": "eslint src/"
          },
          {
            "name": "lint:prettier",
            "command": "prettier -c . --cache"
          }
        ]
      },
      "dependencies": [
        "@turbo/eslint-config",
        "@turbo/tsconfig"
      ],
      "dependents": [
        "@turbo/codemod",
        "@turbo/gen",
        "@turbo/telemetry",
        "@turbo/utils",
        "@turbo/workspaces",
        "@turborepo-examples-tests/basic-npm",
        "@turborepo-examples-tests/basic-pnpm",
        "@turborepo-examples-tests/basic-yarn",
        "@turborepo-examples-tests/kitchen-sink-npm",
        "@turborepo-examples-tests/kitchen-sink-pnpm",
        "@turborepo-examples-tests/kitchen-sink-yarn",
        "@turborepo-examples-tests/non-monorepo-npm",
        "@turborepo-examples-tests/non-monorepo-pnpm",
        "@turborepo-examples-tests/non-monorepo-yarn",
        "@turborepo-examples-tests/with-svelte-npm",
        "@turborepo-examples-tests/with-svelte-pnpm",
        "@turborepo-examples-tests/with-svelte-yarn",
        "@turborepo-examples-tests/with-tailwind-npm",
        "@turborepo-examples-tests/with-tailwind-pnpm",
        "@turborepo-examples-tests/with-tailwind-yarn",
        "create-turbo",
        "eslint-config-turbo",
        "eslint-plugin-turbo",
        "turbo-ignore",
        "turborepo-docs",
        "turborepo-tests-helpers",
        "turborepo-tests-integration"
      ]
    }
  ]
}
```

Author: chris-olszewski

crates/turborepo-lib/src/commands/ls.rs

@@ -83,6 +83,7 @@ struct PackageDetails<'a> {
     name: &'a str,
     tasks: Vec<PackageTask<'a>>,
     dependencies: Vec<&'a str>,
+    dependents: Vec<&'a str>,
 }
 
 #[derive(Clone, Serialize)]
@@ -96,6 +97,7 @@ struct PackageDetailsDisplay<'a> {
     path: &'a AnchoredSystemPath,
     tasks: ItemsWithCount<PackageTask<'a>>,
     dependencies: Vec<&'a str>,
+    dependents: Vec<&'a str>,
 }
 
 impl<'a> From<PackageDetails<'a>> for PackageDetailsDisplay<'a> {
@@ -104,6 +106,7 @@ impl<'a> From<PackageDetails<'a>> for PackageDetailsDisplay<'a> {
             name: val.name,
             path: val.path,
             dependencies: val.dependencies,
+            dependents: val.dependents,
             tasks: ItemsWithCount {
                 count: val.tasks.len(),
                 items: val.tasks,
@@ -252,11 +255,23 @@ impl<'a> PackageDetails<'a> {
             .collect();
         package_dep_names.sort();
 
+        let mut package_rdep_names: Vec<&str> = package_graph
+            .ancestors(&package_node)
+            .into_iter()
+            .filter_map(|dependent| match dependent {
+                PackageNode::Root | PackageNode::Workspace(PackageName::Root) => None,
+                PackageNode::Workspace(PackageName::Other(dep_name)) if dep_name == package => None,
+                PackageNode::Workspace(PackageName::Other(dep_name)) => Some(dep_name.as_str()),
+            })
+            .collect();
+        package_rdep_names.sort();
+
         Ok(Self {
             color_config,
             path: package_path,
             name: package,
             dependencies: package_dep_names,
+            dependents: package_rdep_names,
             tasks: package_json
                 .scripts
                 .iter()

crates/turborepo/tests/snapshots/ls__basic_monorepo_get_info_for_package_`my-app`_([email protected]).snap

@@ -22,7 +22,8 @@ expression: query_output
       },
       "dependencies": [
         "util"
-      ]
+      ],
+      "dependents": []
     }
   ]
 }