Prefer usage of helper `expanded_by_default?`

Stop using `Rails.env.test?` in views.

app/views/clusters/clusters/show.html.haml

@@ -4,7 +4,7 @@
 - page_title _('Kubernetes Cluster')
 - manage_prometheus_path = edit_project_service_path(@cluster.project, 'prometheus') if @project
 
-- expanded = Rails.env.test?
+- expanded = expanded_by_default?
 
 - status_path = clusterable.cluster_status_cluster_path(@cluster.id, format: :json) if can?(current_user, :admin_cluster, @cluster)
 .edit-cluster-form.js-edit-cluster-form{ data: { status_path: status_path,

app/views/groups/edit.html.haml

 - breadcrumb_title "General Settings"
 - @content_class = "limit-container-width" unless fluid_layout
-- expanded = Rails.env.test?
+- expanded = expanded_by_default?
 
 
 %section.settings.gs-general.no-animate#js-general-settings{ class: ('expanded') }

app/views/groups/settings/ci_cd/show.html.haml

 - breadcrumb_title "CI / CD Settings"
 - page_title "CI / CD"
 
-- expanded = Rails.env.test?
+- expanded = expanded_by_default?
 
 %section.settings#ci-variables.no-animate{ class: ('expanded' if expanded) }
   .settings-header

app/views/projects/cleanup/_show.html.haml

-- expanded = Rails.env.test?
+- expanded = expanded_by_default?
 
 %section.settings.no-animate#cleanup{ class: ('expanded' if expanded) }
   .settings-header

app/views/projects/default_branch/_show.html.haml

-- expanded = Rails.env.test?
+- expanded = expanded_by_default?
 
 %section.settings.no-animate#default-branch-settings{ class: ('expanded' if expanded) }
   .settings-header

app/views/projects/deploy_keys/_index.html.haml

-- expanded = Rails.env.test?
+- expanded = expanded_by_default?
 %section.qa-deploy-keys-settings.settings.no-animate#js-deploy-keys-settings{ class: ('expanded' if expanded) }
   .settings-header
     %h4

app/views/projects/edit.html.haml

 - breadcrumb_title _("General Settings")
 - page_title _("General")
 - @content_class = "limit-container-width" unless fluid_layout
-- expanded = Rails.env.test?
+- expanded = expanded_by_default?
 
 %section.settings.general-settings.no-animate.expanded#js-general-settings
   .settings-header

app/views/projects/mirrors/_mirror_repos.html.haml

-- expanded = Rails.env.test?
+- expanded = expanded_by_default?
 - protocols = Gitlab::UrlSanitizer::ALLOWED_SCHEMES.join('|')
 
 %section.settings.project-mirror-settings.js-mirror-settings.no-animate.qa-mirroring-repositories-settings#js-push-remote-settings{ class: ('expanded' if expanded) }

app/views/projects/protected_branches/shared/_index.html.haml

-- expanded = Rails.env.test?
+- expanded = expanded_by_default?
 
 %section.qa-protected-branches-settings.settings.no-animate#js-protected-branches-settings{ class: ('expanded' if expanded) }
   .settings-header

app/views/projects/protected_tags/shared/_index.html.haml

-- expanded = Rails.env.test?
+- expanded = expanded_by_default?
 
 %section.settings.no-animate#js-protected-tags-settings{ class: ('expanded' if expanded) }
   .settings-header

app/views/projects/settings/ci_cd/show.html.haml

@@ -2,7 +2,7 @@
 - page_title _("CI / CD Settings")
 - page_title _("CI / CD")
 
-- expanded = Rails.env.test?
+- expanded = expanded_by_default?
 - general_expanded = @project.errors.empty? ? expanded : true
 
 %section.settings#js-general-pipeline-settings.no-animate{ class: ('expanded' if general_expanded) }