Enable pipeline events by default

Not sure why I missed this before. I thought I added it.

CHANGELOG

@@ -20,6 +20,7 @@ v 8.12.0 (unreleased)
   - Change merge_error column from string to text type
   - Reduce contributions calendar data payload (ClemMakesApps)
   - Add `web_url` field to issue, merge request, and snippet API objects (Ben Boeckel)
+  - Enable pipeline events by default !6278
   - Move parsing of sidekiq ps into helper !6245 (pascalbetz)
   - Expose `sha` and `merge_commit_sha` in merge request API (Ben Boeckel)
   - Set path for all JavaScript cookies to honor GitLab's subdirectory setting !5627 (Mike Greiling)

app/models/service.rb

@@ -12,6 +12,7 @@ class Service < ActiveRecord::Base
   default_value_for :tag_push_events, true
   default_value_for :note_events, true
   default_value_for :build_events, true
+  default_value_for :pipeline_events, true
   default_value_for :wiki_page_events, true
 
   after_initialize :initialize_properties