[CQ] add missing scope_util_test to all test suite

Change-Id: I3cc943147addf3d9c342e23805cf0745510f3b38
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/403703
Reviewed-by: Konstantin Shcheglov <[email protected]>
Reviewed-by: Brian Wilkerson <[email protected]>
Auto-Submit: Phil Quitslund <[email protected]>
Commit-Queue: Phil Quitslund <[email protected]>
Commit-Queue: Brian Wilkerson <[email protected]>
Commit-Queue: Konstantin Shcheglov <[email protected]>

Author: pq

pkg/linter/test/all.dart

@@ -14,6 +14,7 @@ import 'mocks.dart';
 import 'pubspec_test.dart' as pubspec;
 import 'rule_test.dart' as rule;
 import 'rules/all.dart' as rules;
+import 'scope_util_test.dart' as scope_util;
 import 'utils_test.dart' as utils;
 import 'validate_incompatible_rules_test.dart' as validate_incompatible_rules;
 import 'validate_no_rule_description_references_test.dart'
@@ -38,6 +39,7 @@ void main() {
   pubspec.main();
   rule.main();
   rules.main();
+  scope_util.main();
   utils.main();
   validate_incompatible_rules.main();
   validate_no_rule_description_references.main();