Fix markup (and therefore styling) of RTL history mode banner

Right-to-left languages were displaying the government name in
an unusual way, treating the government name as translated text
even though it is still English. This commit fixes the text
direction, as well as setting the correct language for the text
snippet.

Before:
![to 2024 Sunak Conservative government 2022](https://github.com/user-attachments/assets/999781ba-8f6e-4c03-8f6d-00d9b8921c4c)

After:
![2022 to 2024 Sunak Conservative government](https://github.com/user-attachments/assets/d94c7979-03f3-46ca-bc97-4a86951a8b31)

app/views/shared/_history_notice.html.erb

@@ -1,5 +1,8 @@
 <% if content_item.historically_political? %>
   <%= render "govuk_publishing_components/components/notice", {
-    title: t("shared.historically_political", government: content_item.publishing_government),
+    title: sanitize(
+      t("shared.historically_political", government: "<span lang='en' dir='ltr'>#{content_item.publishing_government}</span>"),
+      attributes: %w(lang dir),
+    ),
   } %>
 <% end %>

test/integration/news_article_test.rb

@@ -42,6 +42,14 @@ class NewsArticleTest < ActionDispatch::IntegrationTest
     end
   end
 
+  test "marks up government name correctly" do
+    setup_and_visit_content_item("news_article_history_mode_translated_arabic")
+
+    within ".govuk-notification-banner__content" do
+      assert page.has_css?("span[lang='en'][dir='ltr']", text: "2022 to 2024 Sunak Conservative government")
+    end
+  end
+
   test "does not render with the single page notification button" do
     setup_and_visit_content_item("news_article")
     assert_not page.has_css?(".gem-c-single-page-notification-button")