refactor(web): migrate notion page selectors to tanstack virtual (#34508)

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

web/__mocks__/@tanstack/react-virtual.ts

@@ -0,0 +1,36 @@
+import { vi } from 'vitest'
+
+const mockVirtualizer = ({
+  count,
+  estimateSize,
+}: {
+  count: number
+  estimateSize?: (index: number) => number
+}) => {
+  const getSize = (index: number) => estimateSize?.(index) ?? 0
+
+  return {
+    getTotalSize: () => Array.from({ length: count }).reduce<number>((total, _, index) => total + getSize(index), 0),
+    getVirtualItems: () => {
+      let start = 0
+
+      return Array.from({ length: count }).map((_, index) => {
+        const size = getSize(index)
+        const virtualItem = {
+          end: start + size,
+          index,
+          key: index,
+          size,
+          start,
+        }
+
+        start += size
+        return virtualItem
+      })
+    },
+    measureElement: vi.fn(),
+    scrollToIndex: vi.fn(),
+  }
+}
+
+export { mockVirtualizer as useVirtualizer }