Fix Sidekiq worker and make flash message return a link to the pipelines page

app/controllers/projects/pipeline_schedules_controller.rb

@@ -46,7 +46,7 @@ class Projects::PipelineSchedulesController < Projects::ApplicationController
 
     flash[:notice] =
       if job_id
-        'Successfully scheduled pipeline to run immediately'
+        "Successfully scheduled a pipeline to run. Go to the <a href=\"#{project_pipelines_path(@project)}\">Pipelines page</a> for details".html_safe
       else
         'Unable to schedule a pipeline to run immediately'
       end

app/workers/run_pipeline_schedule_worker.rb

 class RunPipelineScheduleWorker
-  include Sidekiq::Worker
+  include ApplicationWorker
   include PipelineQueue
 
   enqueue_in group: :creation

spec/controllers/projects/pipeline_schedules_controller_spec.rb

@@ -380,7 +380,7 @@ describe Projects::PipelineSchedulesController do
 
         post :play, namespace_id: project.namespace.to_param, project_id: project, id: pipeline_schedule.id
 
-        expect(flash[:notice]).to eq 'Successfully scheduled pipeline to run immediately'
+        expect(flash[:notice]).to start_with 'Successfully scheduled a pipeline to run'
         expect(response).to have_gitlab_http_status(302)
       end
     end