refactor: allocate api::Session on cpp heap (#48141)

spec/lib/heapsnapshot-helpers.js

@@ -0,0 +1,25 @@
+export function containsRetainingPath (snapshot, retainingPath, options) {
+  let root = snapshot.filter(
+    (node) => node.name === retainingPath[0] && node.type !== 'string');
+  for (let i = 1; i < retainingPath.length; i++) {
+    const needle = retainingPath[i];
+    const newRoot = [];
+    for (const node of root) {
+      for (let j = 0; j < node.outgoingEdges.length; j++) {
+        const child = node.outgoingEdges[j].to;
+        if (child.type === 'string') continue;
+        if (child.name === needle) {
+          newRoot.push(child);
+        }
+      }
+    }
+    if (!newRoot.length) {
+      console.log(`No retaining path found for ${needle}`);
+      return false;
+    }
+    root = newRoot;
+  }
+  return options?.occurrances
+    ? root.length === options.occurrances
+    : true;
+}