Support conditional rendering of top nav buttons.

app/views/projects/issues/_nav_btns.html.haml

-= link_to params.merge(rss_url_options), class: 'btn btn-default append-right-10 has-tooltip', title: 'Subscribe' do
-  = icon('rss')
-= render 'projects/issues/export_issues/button'
+- show_rss_button = local_assigns.fetch(:show_rss_button, true)
+- show_export_button = local_assigns.fetch(:show_export_button, true)
+
+- if show_rss_button
+  = link_to params.merge(rss_url_options), class: 'btn btn-default append-right-10 has-tooltip', title: 'Subscribe' do
+    = icon('rss')
+
+- if show_export_button
+  = render 'projects/issues/export_issues/button'
+
 - if @can_bulk_update
   = button_tag "Edit issues", class: "btn btn-default append-right-10 js-bulk-update-toggle"
+
 = link_to "New issue", new_project_issue_path(@project,
                                               issue: { assignee_id: issues_finder.assignee.try(:id),
                                                        milestone_id: issues_finder.milestones.first.try(:id) }),

ee/app/views/projects/issues/service_desk.html.haml

 - @no_container = true
-- @can_bulk_update = can?(current_user, :admin_issue, @project)
+- @can_bulk_update = false
 
 - page_title "Service Desk"
 
@@ -9,14 +9,10 @@
   = webpack_bundle_tag 'service_desk_issues'
   = webpack_bundle_tag 'issues'
 
-= content_for :meta_tags do
-  = auto_discovery_link_tag(:atom, params.merge(rss_url_options), title: "#{@project.name} issues")
+
 - if show_new_nav?
   - content_for :breadcrumbs_extra do
-    = render "projects/issues/nav_btns"
-
-- if project_issues(@project).exists?
-  = render 'projects/issues/export_issues/csv_download'
+    = render "projects/issues/nav_btns", show_export_button: false, show_rss_button: false
 
   - support_bot_attrs = User.support_bot.to_json(only: [:id, :name, :username, :avatar_url])
 
@@ -31,7 +27,7 @@
       = render 'shared/issuable/bulk_update_sidebar', type: :issues
 
     - if @issues.present?
-      = render 'service_desk_empty_state_content'
+      = render 'service_desk_info_content'
 
     .issues-holder
       = render 'projects/issues/issues', empty_state_path: 'service_desk_empty_state'