Delegate CiVariable delegation to API

Instead of Resource::CiVariable fabricating via the browser_ui, let's
delegate to the API instead. (will shave off roughly 3-4s every use)

Override resource_web_url to catch ResourceURLMissingError as there
is no "show" action for a CI/CD var
Signed-off-by: ddavison <ddavison@gitlab.com>

qa/qa/resource/ci_variable.rb

@@ -25,6 +25,33 @@ module QA
           end
         end
       end
+
+      def fabricate_via_api!
+        resource_web_url(api_get)
+      rescue ResourceNotFoundError
+        super
+      end
+
+      def resource_web_url(resource)
+        super
+      rescue ResourceURLMissingError
+        # this particular resource does not expose a web_url property
+      end
+
+      def api_get_path
+        "/projects/#{project.id}/variables/#{key}"
+      end
+
+      def api_post_path
+        "/projects/#{project.id}/variables"
+      end
+
+      def api_post_body
+        {
+          key: key,
+          value: value
+        }
+      end
     end
   end
 end

qa/qa/resource/project.rb

@@ -7,6 +7,7 @@ module QA
     class Project < Base
       include Events::Project
 
+      attribute :id
       attribute :name
       attribute :description