Add a message if there are more than 50 rows

Similar to how we do it on the check page, we should indicate if there
are more results than we can show. No-one’s really complained about the
absence of this, but it can’t hurt.

app/templates/partials/jobs/notifications.html

@@ -50,6 +50,12 @@
     {% endcall %}
   {% endcall %}
 
+  {% if more_than_one_page %}
+    <p class="table-show-more-link">
+      Only showing the first 50 rows
+    </p>
+  {% endif %}
+
 {% if notifications %}
   </div>
 {% endif %}

tests/app/main/views/test_jobs.py

@@ -95,6 +95,7 @@ def test_should_show_page_for_one_job(
         )
         assert csv_link.text == 'Download this report'
         assert page.find('span', {'id': 'time-left'}).text == 'Data available for 7 days'
+        assert page.find('p', {'class': 'table-show-more-link'}).text.strip() == 'Only showing the first 50 rows'
         mock_get_notifications.assert_called_with(
             service_one['id'],
             fake_uuid,

tests/conftest.py

@@ -910,14 +910,16 @@ def mock_get_notifications(mocker, api_user_active):
                 template={'template_type': set_template_type, 'name': 'name', 'id': 'id', 'version': 1},
                 rows=rows,
                 status=set_status,
-                job=job
+                job=job,
+                with_links=True
             )
         else:
             return notification_json(
                 service_id,
                 rows=rows,
                 status=set_status,
-                job=job
+                job=job,
+                with_links=True
             )
 
     return mocker.patch(