Notification ping when the number of unique Zendesk or Salesforce links reach a threshold

The step 2 at triage-ops#156

• Count the number of unique zendesk links in the discussions / comments.
• If 5 and above mention the Engineering Manager and Product Manager for that group.
• If more than 7 and above mention the Dir of Product for that group.
• No need to store any caching we just get a count before adding logic to the notification.