feat(linter): Enable collection_methods_unrelated_type rule

The linter configuration has been updated to enable the 'collection_methods_unrelated_type' rule. This will help ensure that our code adheres to best practices for using collection methods in Dart.

analysis_options.yaml

@@ -11,7 +11,7 @@ analyzer:
 # Lint rules and documentation, see http://dart-lang.github.io/linter/lints
 linter:
   rules:
-    # - collection_methods_unrelated_type
+    - collection_methods_unrelated_type
     - require_trailing_commas
 
 dart_code_linter: