test: cover extends with rule config

Author: incendial

test/resources/analysis_options_with_extends.yaml

@@ -13,5 +13,7 @@ dart_code_metrics:
   metrics-exclude:
     - test/**
   rules:
-    - rule-id4
+    - rule-id4:
+        exclude:
+          - test/**
     - rule-id5

test/resources/test_lints/lib/presets.yaml

@@ -1,3 +1,4 @@
 dart_code_metrics:
   rules:
     - rule-id10
+    - rule-id4

test/src/config_builder/models/analysis_options_test.dart

@@ -141,6 +141,10 @@ void main() {
         (options.options['dart_code_metrics'] as Map<String, Object>)['rules'],
         allOf(contains('rule-id10')),
       );
+      expect(
+        options.readMapOfMap(['rules'], packageRelated: true)['rule-id4'],
+        containsPair('exclude', ['test/**']),
+      );
     });
   });