When the analyzer detects an unused parameter, it reports `unused_element` which can be ignored with an inline ignore like `// ignore: unused_element`. The analyzer will start reporting instead, `unused_element_parameter`. There are ignores in flutter/flutter that need to be updated to the new code. In order to incrementally migrate, they can be changed to `// ignore: unused_element, unused_element_parameter`.

After flutter/flutter is using a new enough analyzer, we can then change those to `// ignore: unused_element_parameter`.

Work towards https://github.com/flutter/flutter/issues/126924