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

app/views/api/v1/models/_conversation.json.jbuilder

@@ -1,3 +1,5 @@
+# This file is used to render conversation data search API response.
+
 json.id conversation.display_id
 json.uuid conversation.uuid
 json.created_at conversation.created_at.to_i