Ignore unused_element_parameter (#126926)

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 flutter/flutter#126924

Author: srawlins

packages/flutter/lib/src/widgets/widget_inspector.dart

@@ -3256,7 +3256,7 @@ class _Location {
     required this.file,
     required this.line,
     required this.column,
-    // ignore: unused_element
+    // ignore: unused_element, unused_element_parameter
     this.name,
   });