The notification helper does not account for notifications being sent to 'Component Lead'

Summary

At present, the notification helper (part of the admin helper plugin) doesn't take 'Component Lead' into account. So if a notification should be sent to the component lead then the user will not realise this. Could we please add 'Component Lead' to the notification helper?

Steps to Reproduce:

1. Configure SAMPLE project with a component named component:
   
2. Configure a notification with all component lead set to all events
   
3. Create an issue with the component(eg. SAMPLE-232):
   

Expected Result:

Notification Helper should show that user admin receive notification for any event for that issue.

Actual Result:

Notification show that user cannot receive any notification for that issue:

Workaround

There is currently no workaround for this issue.