feat: Conversation API to return applied_sla and sla_events (#9174)

* chore: Add sla_events to push_event_data

* chore: Return SLA details in the API

* chore: feature lock sla push event data

* Update _conversation.json.jbuilder

* chore: rubocop fixes

spec/presenters/conversations/event_data_presenter_spec.rb

@@ -38,7 +38,8 @@ RSpec.describe Conversations::EventDataPresenter do
     end
 
     it 'returns push event payload' do
-      expect(presenter.push_data).to eq(expected_data)
+      # the exceptions are the values that would be added in enterprise edition.
+      expect(presenter.push_data.except(:applied_sla, :sla_events)).to include(expected_data)
     end
   end
 end