add thumbnails to the books example to make memory leaks easier to test (#1353)

* add thumbnails to the books example to make memory leaks easier to test

* also add profile build

* migrate material 3 demo code to avoid warning

* Revert "migrate material 3 demo code to avoid warning"

This reverts commit 7df37d9f65.

* fix lints in various packages

* DoNothingAndStopPropagationIntent const conflicts between stable and beta, add lint ignore for now

form_app/lib/src/validation.dart

@@ -27,7 +27,10 @@ class _FormValidationDemoState extends State<FormValidationDemo> {
           Padding(
             padding: const EdgeInsets.all(8),
             child: TextButton(
-              style: TextButton.styleFrom(primary: Colors.white),
+              style: TextButton.styleFrom(
+                // ignore: deprecated_member_use
+                primary: Colors.white,
+              ),
               child: const Text('Submit'),
               onPressed: () {
                 // Validate the form by getting the FormState from the GlobalKey