`test/integration.shard/hot_reload_with_asset_test.dart: hot restart does not need to sync assets on the first reload` is very flaky

Parent issue: https://github.com/flutter/flutter/issues/153049. Also documented in https://github.com/flutter/flutter/issues/153026.

I've noticed this test flaking very often on many open PRs.

Example: https://ci.chromium.org/ui/p/flutter/builders/try/Mac%20tool_integration_tests_2_5/790/overview