Remove dashboard_pipeline_status feature flag

Hiding the CI status was a quick workaround to prevent the project
dashboard from failing in case Gitaly is down.

We now catch Gitaly exceptions so this is no longer needed.

app/views/dashboard/projects/_projects.html.haml

-= render 'shared/projects/list', projects: @projects, pipeline_status: Feature.enabled?(:dashboard_pipeline_status, default_enabled: true), user: current_user
+= render 'shared/projects/list', projects: @projects, pipeline_status: true, user: current_user

changelogs/unreleased/209061-remove-dashboard-pipeline-status-ff.yml

+---
+title: Remove dashboard_pipeline_status feature flag
+merge_request: 55472
+author:
+type: other

config/feature_flags/development/dashboard_pipeline_status.yml

----
-name: dashboard_pipeline_status
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/22029
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/209061
-milestone: '12.7'
-type: development
-group: group::continuous integration
-default_enabled: true

spec/features/dashboard/projects_spec.rb

@@ -198,14 +198,6 @@ RSpec.describe 'Dashboard Projects' do
       it_behaves_like 'hidden pipeline status'
     end
 
-    context 'when dashboard_pipeline_status is disabled' do
-      before do
-        stub_feature_flags(dashboard_pipeline_status: false)
-      end
-
-      it_behaves_like 'hidden pipeline status'
-    end
-
     context "when last_pipeline is missing" do
       before do
         project.last_pipeline.delete