feat: API to download breached conversations (#9150)

* feat: add download conversations endpoint

* feat: template for conversation list download

* feat: setup download API and tests

* chore: revert formatting change

* feat: rename download method

* feat: rename template

* feat: include sla_policy table in download query

* refactor: add nil safety to assignee

* chore: Update en.yml

* fix: remove applied_sla relation

enterprise/app/views/api/v1/accounts/applied_slas/download.csv.erb

@@ -0,0 +1,26 @@
+<% headers = [
+  I18n.t('reports.sla_csv.conversation_id'),
+  I18n.t('reports.sla_csv.sla_policy_breached'),
+  I18n.t('reports.sla_csv.assignee'),
+  I18n.t('reports.sla_csv.team'),
+  I18n.t('reports.sla_csv.inbox'),
+  I18n.t('reports.sla_csv.labels'),
+  I18n.t('reports.sla_csv.conversation_link'),
+  I18n.t('reports.sla_csv.breached_events')
+] %>
+<%= CSV.generate_line headers %>
+
+<% @breached_slas.each do |sla| %>
+  <% breached_events = sla.sla_events.map(&:event_type).join(', ') %>
+  <% conversation = sla.conversation %>
+  <%= CSV.generate_line([
+    conversation.display_id,
+    sla.sla_policy.name,
+    conversation.assignee&.name,
+    conversation.team&.name,
+    conversation.inbox&.name,
+    conversation.cached_label_list,
+    app_account_conversation_url(account_id: conversation.account_id, id: conversation.display_id),
+    breached_events
+  ]) %>
+<% end %>