Restore some unrelated changes from d9cb907c

app/views/search/results/_issue.html.haml

 .search-result-row
   %h4
     = confidential_icon(issue)
-    = link_to [issue.project.namespace.becomes(Namespace), issue.project, issue] do
+    = link_to namespace_project_issue_path(issue.project.namespace.becomes(Namespace), issue.project, issue) do
       %span.term.str-truncated= issue.title
     - if issue.closed?
       %span.badge.badge-danger.prepend-left-5= _("Closed")

app/views/search/results/_merge_request.html.haml

 .search-result-row
   %h4
-    = link_to [merge_request.target_project.namespace.becomes(Namespace), merge_request.target_project, merge_request] do
+    = link_to namespace_project_merge_request_path(merge_request.target_project.namespace.becomes(Namespace), merge_request.target_project, merge_request) do
       %span.term.str-truncated= merge_request.title
     - if merge_request.merged?
       %span.badge.badge-primary.prepend-left-5= _("Merged")

app/views/search/results/_milestone.html.haml

 .search-result-row
   %h4
-    = link_to [milestone.project.namespace.becomes(Namespace), milestone.project, milestone] do
+    = link_to namespace_project_milestone_path(milestone.project.namespace.becomes(Namespace), milestone.project, milestone) do
       %span.term.str-truncated= milestone.title
   - if milestone.description.present?