Ask confirmation to delete drafts and questions

This is similar to what we do in almost every other page of the admin
section.

app/views/admin/legislation/draft_versions/edit.html.erb

@@ -19,6 +19,7 @@
           :destroy,
           @draft_version,
           method: :delete,
+          confirm: true,
           class: "button hollow alert"
         ) %>
       </div>

app/views/admin/legislation/questions/edit.html.erb

@@ -19,6 +19,7 @@
             :destroy,
             @question,
             method: :delete,
+            confirm: true,
             class: "button hollow alert"
           ) %>
         </div>

spec/system/admin/legislation/draft_versions_spec.rb

@@ -78,7 +78,10 @@ describe "Admin legislation draft versions", :admin do
     version = create(:legislation_draft_version, body: "Version 1")
 
     visit edit_admin_legislation_process_draft_version_path(version.process, version)
-    click_button "Delete"
+
+    accept_confirm("Are you sure? This action will delete \"Version 1\" and can't be undone.") do
+      click_button "Delete"
+    end
 
     expect(page).to have_content "Draft deleted successfully"
   end

spec/system/admin/legislation/questions_spec.rb

@@ -75,7 +75,9 @@ describe "Admin legislation questions", :admin do
 
       visit edit_admin_legislation_process_question_path(process, question)
 
-      click_button "Delete"
+      accept_confirm("Are you sure? This action will delete \"Question 2\" and can't be undone.") do
+        click_button "Delete"
+      end
 
       expect(page).to have_content "Questions"
       expect(page).to have_content "Question 1"