Refactor pipeline artifacts logic

This MR refactors our logic determining if a pipeline can generate
a coverage report and if a given pipeline has a coverage report
attached to it.

app/models/ci/pipeline.rb

@@ -865,7 +865,11 @@ module Ci
     end
 
     def has_coverage_reports?
-      self.has_reports?(Ci::JobArtifact.coverage_reports)
+      pipeline_artifacts&.has_code_coverage?
+    end
+
+    def can_generate_coverage_reports?
+      has_reports?(Ci::JobArtifact.coverage_reports)
     end
 
     def test_report_summary

app/models/merge_request.rb

@@ -1346,7 +1346,7 @@ class MergeRequest < ApplicationRecord
   def has_coverage_reports?
     return false unless Feature.enabled?(:coverage_report_view, project)
 
-    actual_head_pipeline&.pipeline_artifacts&.has_code_coverage?
+    actual_head_pipeline&.has_coverage_reports?
   end
 
   def has_terraform_reports?

app/services/ci/pipelines/create_artifact_service.rb

@@ -4,8 +4,8 @@ module Ci
     class CreateArtifactService
       def execute(pipeline)
         return unless ::Gitlab::Ci::Features.coverage_report_view?(pipeline.project)
-        return unless pipeline.has_coverage_reports?
-        return if pipeline.pipeline_artifacts.has_code_coverage?
+        return unless pipeline.can_generate_coverage_reports?
+        return if pipeline.has_coverage_reports?
 
         file = build_carrierwave_file(pipeline)
 

spec/models/ci/pipeline_spec.rb

@@ -2944,6 +2944,22 @@ RSpec.describe Ci::Pipeline, :mailer, factory_default: :keep do
   describe '#has_coverage_reports?' do
     subject { pipeline.has_coverage_reports? }
 
+    context 'when pipeline has a code coverage artifact' do
+      let(:pipeline) { create(:ci_pipeline, :with_coverage_report_artifact, :running, project: project) }
+
+      it { expect(subject).to be_truthy }
+    end
+
+    context 'when pipeline does not have a code coverage artifact' do
+      let(:pipeline) { create(:ci_pipeline, :success, project: project) }
+
+      it { expect(subject).to be_falsey }
+    end
+  end
+
+  describe '#can_generate_coverage_reports?' do
+    subject { pipeline.can_generate_coverage_reports? }
+
     context 'when pipeline has builds with coverage reports' do
       before do
         create(:ci_build, :coverage_reports, pipeline: pipeline, project: project)