feat: Order conversations by priority (#7053)

app/javascript/shared/constants/messages.js

@@ -27,6 +27,14 @@ export const CONVERSATION_PRIORITY = {
   MEDIUM: 'medium',
 };
 
+export const CONVERSATION_PRIORITY_ORDER = {
+  urgent: 1,
+  high: 2,
+  medium: 3,
+  low: 4,
+  null: 5,
+};
+
 // Size in mega bytes
 export const MAXIMUM_FILE_UPLOAD_SIZE = 40;
 export const MAXIMUM_FILE_UPLOAD_SIZE_TWILIO_SMS_CHANNEL = 5;