Add scaffold for remaining statuses-related classes

lib/gitlab/ci/status/extended/base.rb

+module Gitlab::Ci
+  module Status
+    module Extended
+      module Base
+        def matches?(_subject)
+          raise NotImplementedError
+        end
+      end
+    end
+  end
+end

lib/gitlab/ci/status/extended/pipeline/common.rb

+module Gitlab::Ci
+  module Status
+    module Extended
+      module Pipeline
+        module Common
+          def initialize(pipeline)
+            @pipeline = pipeline
+          end
+
+          def has_details?
+            true
+          end
+
+          def details_path
+          end
+
+          def has_action?
+            false
+          end
+        end
+      end
+    end
+  end
+end

lib/gitlab/ci/status/extended/pipeline/success_with_warnings.rb

+module Gitlab::Ci
+  module Status
+    module Extended
+      module Pipeline
+        class SuccessWithWarnings < SimpleDelegator
+          extend Status::Extended::Base
+
+          def label
+            'passed with warnings'
+          end
+
+          def icon
+            'icon_status_warning'
+          end
+
+          def self.matches?(pipeline)
+            pipeline.success? && pipeline.has_warnings?
+          end
+        end
+      end
+    end
+  end
+end

lib/gitlab/ci/status/factory.rb

+module Gitlab::Ci
+  module Status
+    class Factory
+    end
+  end
+end