Remove jobs from the dashboard

We’ve done this already for services with the upload letters permission.
And all services can upload letters now.

But we’re still returning it in the JSON response we use to AJAX-ify the
page.

Since the jobs response can query stats for up to 50 jobs at a time this
puts some load on the API/database. Hopefully this might drop that load
a bit.

tests/app/test_navigation.py

@@ -191,7 +191,7 @@ def test_caseworkers_get_caseworking_navigation(
     )
     page = client_request.get('main.choose_template', service_id=SERVICE_ONE_ID)
     assert normalize_spaces(page.select_one('header + .govuk-width-container nav').text) == (
-        'Templates Sent messages Team members'
+        'Templates Sent messages Uploads Team members'
     )