feat(ee): Add SLA management UI (#8777)

Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>
Co-authored-by: Pranav <pranav@chatwoot.com>

app/javascript/dashboard/featureFlags.js

@@ -18,4 +18,5 @@ export const FEATURE_FLAGS = {
   AUDIT_LOGS: 'audit_logs',
   INSERT_ARTICLE_IN_REPLY: 'insert_article_in_reply',
   INBOX_VIEW: 'inbox_view',
+  SLA: 'sla',
 };