Update dependencies and enhance VFS staleness testing

- Updated several dependencies in Cargo.lock, including `clap`, `env_logger`, and `rand`, to their latest versions for improved functionality and security.
- Introduced a new API endpoint `/api/validate-tree` for checking tree freshness without applying corrections, enhancing the validation process.
- Added a `TreeFreshnessReport` struct to encapsulate the results of the tree freshness check, providing detailed insights into discrepancies.
- Completed multiple todos in the VFS staleness test plan, ensuring comprehensive coverage for various scenarios and improving the robustness of the testing framework.

These changes enhance the project's dependency management and testing capabilities, ensuring better alignment with the latest implementation standards.

rojo-test/serve-tests/connected_models/src/DirModel/init.meta.json5

@@ -1,3 +1,3 @@
 {
-  "$className": "Folder"
+  "className": "Folder"
 }

rojo-test/serve-tests/stale_tree/default.project.json5

@@ -0,0 +1,10 @@
+{
+  "name": "stale_tree",
+  "tree": {
+    "$className": "DataModel",
+    "ReplicatedStorage": {
+      "$className": "ReplicatedStorage",
+      "$path": "src"
+    }
+  }
+}

rojo-test/serve-tests/stale_tree/src/a.luau

@@ -0,0 +1 @@
+return "a"

rojo-test/serve-tests/stale_tree/src/b.luau

@@ -0,0 +1 @@
+return "b"

rojo-test/serve-tests/stale_tree/src/c.luau

@@ -0,0 +1 @@
+return "c"

rojo-test/serve-tests/stale_tree/src/d.luau

@@ -0,0 +1 @@
+return "d"

rojo-test/serve-tests/stale_tree/src/e.luau

@@ -0,0 +1 @@
+return "e"

rojo-test/serve-tests/stale_tree/src/sub/nested.luau

@@ -0,0 +1 @@
+return "nested"