feat: sla-2 add automation backend support for SLA (#8775)

* feat: add automation support for SLA

* feat: add sla action in automtion UI

* chore: revert frontend changes

* chore: refactor to ee namespace

* chore: refactor automation rule to ee namespace

* feat: create applied_sla table entry

* chore: add applied_sla spec

* chore: rubocop fixes

---------

Co-authored-by: Sojan <sojan@pepalo.com>

enterprise/app/models/enterprise/automation_rule.rb

@@ -0,0 +1,9 @@
+module Enterprise::AutomationRule
+  def conditions_attributes
+    super + %w[sla_policy_id]
+  end
+
+  def actions_attributes
+    super + %w[add_sla]
+  end
+end

enterprise/app/services/enterprise/action_service.rb

@@ -0,0 +1,15 @@
+module Enterprise::ActionService
+  def add_sla(sla_policy)
+    @conversation.update!(sla_policy_id: sla_policy.id)
+    create_applied_sla(sla_policy)
+  end
+
+  def create_applied_sla(sla_policy)
+    AppliedSla.create!(
+      account_id: @conversation.account_id,
+      sla_policy_id: sla_policy.id,
+      conversation_id: @conversation.id,
+      sla_status: 'active'
+    )
+  end
+end