Make successful pipeline emails off for watchers

Closes #24845

app/services/notification_service.rb

@@ -591,7 +591,11 @@ class NotificationService
     custom_action = build_custom_key(action, target)
     recipients = target.participants(current_user)
-    recipients = add_project_watchers(recipients, project)
+
+    # TODO: CLEAN ME UP!
+    unless custom_action == :success_pipeline
+      recipients = add_project_watchers(recipients, project)
+    end
     recipients = add_custom_notifications(recipients, project, custom_action)
     recipients = reject_mention_users(recipients, project)

changelogs/unreleased/remove-successful-pipeline-emails-for-now.yml

+---
+title: Make successful pipeline emails off for watchers
+merge_request: 8176
+author:

doc/workflow/notifications.md

@@ -73,7 +73,7 @@ In all of the below cases, the notification will be sent to:
     ...with notification level "Participating" or higher
-- Watchers: users with notification level "Watch"
+- Watchers: users with notification level "Watch" (however successful pipeline would be off for watchers)
 - Subscribers: anyone who manually subscribed to the issue/merge request
 - Custom: Users with notification level "custom" who turned on notifications for any of the events present in the table below