hide shared runner limit warning on public projects

app/views/shared/_shared_runner_minutes_limit.html.haml

 - project = local_assigns.fetch(:project, nil)
 - namespace = local_assigns.fetch(:namespace, project && project.namespace)
+- has_limit = (project || namespace).shared_runners_minutes_limit_enabled?
 - can_see_status = project.nil? || can?(current_user, :create_pipeline, project)
-- if cookies[:hide_shared_runner_quota_message].blank? && namespace.shared_runners_minutes_used? && can_see_status
+- if cookies[:hide_shared_runner_quota_message].blank? && has_limit && namespace.shared_runners_minutes_used? && can_see_status
   .shared-runner-quota-message.alert.alert-warning.hidden-xs
     = namespace.name
     has exceeded their build minutes quota. Pipelines will not run anymore on shared runners.

spec/features/ci_shared_runner_limits_spec.rb

@@ -2,7 +2,7 @@ require 'spec_helper'
 
 feature 'CI shared runner limits', feature: true do
   let(:user) { create(:user) }
-  let!(:project) { create(:project, :public, namespace: group, shared_runners_enabled: true) }
+  let!(:project) { create(:project, namespace: group, shared_runners_enabled: true) }
   let(:group) { create(:group) }
 
   before do