Merge branch 'issue_344279_clusters_controller_spec' into 'master'

Fix Style/OpenStructUse offenses clusters_controller_spec

See merge request gitlab-org/gitlab!75188

.rubocop_todo/style/open_struct_use.yml

@@ -14,7 +14,6 @@ Style/OpenStructUse:
   - lib/gitlab/import_export/after_export_strategies/base_after_export_strategy.rb
   - lib/gitlab/testing/request_inspector_middleware.rb
   - lib/mattermost/session.rb
-  - spec/controllers/admin/clusters_controller_spec.rb
   - spec/controllers/groups/clusters_controller_spec.rb
   - spec/controllers/import/fogbugz_controller_spec.rb
   - spec/controllers/import/gitlab_controller_spec.rb

spec/controllers/admin/clusters_controller_spec.rb

@@ -278,7 +278,8 @@ RSpec.describe Admin::ClustersController do
         end
         allow_next_instance_of(GoogleApi::CloudPlatform::Client) do |instance|
           allow(instance).to receive(:projects_zones_clusters_create) do
-            OpenStruct.new(
+            double(
+              'instance',
               self_link: 'projects/gcp-project-12345/zones/us-central1-a/operations/ope-123',
               status: 'RUNNING'
             )