Test flake: integration_test/test/live_connection/eval_and_inspect_test.dart

[elliette]

integration_test/test/live_connection/eval_and_inspect_test.dart has begun flaking with same failure as before:

Failure message: TextContainingWidgetFinder:<Found 0 widgets with text containing Variable button is created : []>

Here was the initial fix: #8123

[elliette]

We're still seeing this error (see for example https://github.com/flutter/devtools/actions/runs/11488753091/job/31976185527?pr=8460) so we either need to up the number of retries again or find another way of determining when the backend has completed the eval request.