Rust: ignore crate graph elements from summary stats

These elements depend on the version of the standard libraries and platform

rust/ql/src/queries/summary/SummaryStats.ql

@@ -11,9 +11,21 @@ import codeql.rust.Concepts
 import codeql.rust.Diagnostics
 import Stats
 
+class CrateElement extends Element {
+  CrateElement() {
+    this instanceof ModuleContainer or
+    this instanceof Type or
+    this instanceof ValueItem or
+    this instanceof TypeItem or
+    this instanceof VariantData or
+    this instanceof EnumVariant
+  }
+}
+
 from string key, int value
 where
-  key = "Elements extracted" and value = count(Element e | not e instanceof Unextracted)
+  key = "Elements extracted" and
+  value = count(Element e | not e instanceof Unextracted and not e instanceof CrateElement)
   or
   key = "Elements unextracted" and value = count(Unextracted e)
   or