Remove warnings from pipeline view

Remove warnings from pipeline view
and remove related test coverage.

app/views/projects/pipelines/_pipeline_warnings.html.haml

-- total_warnings = warnings.length
-- message = warning_header(total_warnings)
-
-- if warnings.any?
-  .bs-callout.bs-callout-warning
-    %details
-      %summary.gl-mb-2= message
-      - warnings.map(&:content).each do |warning|
-        = markdown(warning)

app/views/projects/pipelines/show.html.haml

@@ -19,7 +19,6 @@
       - lint_link_start = '<a href="%{url}">'.html_safe % { url: lint_link_url }
       = s_('You can also test your %{gitlab_ci_yml} in %{lint_link_start}CI Lint%{lint_link_end}').html_safe % { gitlab_ci_yml: '.gitlab-ci.yml', lint_link_start: lint_link_start, lint_link_end: '</a>'.html_safe }
 
-  = render "projects/pipelines/pipeline_warnings", warnings: @pipeline.warning_messages(limit: Gitlab::Ci::Warnings::MAX_LIMIT)
   = render "projects/pipelines/with_tabs", pipeline: @pipeline, pipeline_has_errors: pipeline_has_errors
 
 .js-pipeline-details-vue{ data: { endpoint: project_pipeline_path(@project, @pipeline, format: :json) } }

spec/views/projects/pipelines/show.html.haml_spec.rb

@@ -16,24 +16,6 @@ RSpec.describe 'projects/pipelines/show' do
     stub_feature_flags(new_pipeline_form: false)
   end
 
-  shared_examples 'pipeline with warning messages' do
-    let(:warning_messages) do
-      [double(content: 'warning 1'), double(content: 'warning 2')]
-    end
-
-    before do
-      allow(pipeline).to receive(:warning_messages).and_return(warning_messages)
-    end
-
-    it 'displays the warnings' do
-      render
-
-      expect(rendered).to have_css('.bs-callout-warning')
-      expect(rendered).to have_content('warning 1')
-      expect(rendered).to have_content('warning 2')
-    end
-  end
-
   context 'when pipeline has errors' do
     before do
       allow(pipeline).to receive(:yaml_errors).and_return('some errors')
@@ -51,10 +33,6 @@ RSpec.describe 'projects/pipelines/show' do
 
       expect(rendered).not_to have_css('ul.pipelines-tabs')
     end
-
-    context 'when pipeline has also warnings' do
-      it_behaves_like 'pipeline with warning messages'
-    end
   end
 
   context 'when pipeline is valid' do
@@ -69,9 +47,5 @@ RSpec.describe 'projects/pipelines/show' do
 
       expect(rendered).to have_css('ul.pipelines-tabs')
     end
-
-    context 'when pipeline has warnings' do
-      it_behaves_like 'pipeline with warning messages'
-    end
   end
 end