Fix CodeReviewMetrics worker failure with kwargs

It appears that Sidekiq does not support jobs with
keyword arguments. See link below for details:
https://github.com/mperham/sidekiq/issues/2372

ee/app/workers/analytics/code_review_metrics_worker.rb

@@ -8,12 +8,12 @@ module Analytics
 
     idempotent!
 
-    def perform(operation, merge_request_id, **execute_args)
+    def perform(operation, merge_request_id, execute_kwargs = {})
       ::MergeRequest.find_by_id(merge_request_id).try do |merge_request|
         break unless merge_request.project.feature_available?(:code_review_analytics)
 
         operation_klass = operation.constantize
-        operation_klass.new(merge_request).execute(**execute_args)
+        operation_klass.new(merge_request).execute(**execute_kwargs.deep_symbolize_keys)
       end
     end
   end

ee/lib/analytics/merge_request_metrics_refresh.rb

@@ -16,9 +16,9 @@ module Analytics
       end
     end
 
-    def execute_async(*args)
+    def execute_async(**kwargs)
       merge_requests.each do |mr|
-        CodeReviewMetricsWorker.perform_async(self.class.name, mr.id, *args)
+        CodeReviewMetricsWorker.perform_async(self.class.name, mr.id, **kwargs)
       end
     end
 

ee/spec/services/merge_requests/approval_service_spec.rb

@@ -98,7 +98,7 @@ describe MergeRequests::ApprovalService do
 
           it 'schedules RefreshApprovalsData' do
             expect(Analytics::CodeReviewMetricsWorker)
-              .to receive(:perform_async).with('Analytics::RefreshApprovalsData', merge_request.id)
+              .to receive(:perform_async).with('Analytics::RefreshApprovalsData', merge_request.id, {})
 
             service.execute(merge_request)
           end