Only count GL pipelines in usage data ping

Now it includes all pipelines, also from external providers. This wasn't
what the product team wanted. Now this is limited to pipelines where the
source is everything but external. This will lead to historical data
being incorrectly marked this way.

Fixes gitlab-org/gitlab-ce#33172

lib/gitlab/usage_data.rb

@@ -20,7 +20,7 @@ module Gitlab
           counts: {
             boards: Board.count,
             ci_builds: ::Ci::Build.count,
-            ci_pipelines: ::Ci::Pipeline.count,
+            ci_pipelines: ::Ci::Pipeline.where.not(source: :external).count,
             ci_runners: ::Ci::Runner.count,
             ci_triggers: ::Ci::Trigger.count,
             ci_pipeline_schedules: ::Ci::PipelineSchedule.count,