Show only relevant platform admin settings for broadcast service

A few of note

Count in list of live services - this should be set to no in the API (to
be implemented) so we never show broadcast services in the list of live
services to reduce security leaks

Organisation - all broadcast services are currently going to be found in
a single organisation so we keep track of them easily. Therefore there
is no need to allow the changing of the organisation

Email authentication - we may in time not allow these services to use
email auth to log in but this hasn't been decided so let's keep it for
the moment

Rate limit - although a service may end up using our API to create
broadcasts, there is currently no rate limit check on this endpoint
and it's also extremely unlikely that any service would ever breach
the default limit

tests/app/main/views/test_service_settings.py

@@ -149,6 +149,52 @@ def test_should_show_overview(
     app.service_api_client.get_service.assert_called_with(SERVICE_ONE_ID)
 
 
+def test_platform_admin_sees_only_relevant_settings_for_broadcast_service(
+        client,
+        mocker,
+        api_user_active,
+        no_reply_to_email_addresses,
+        no_letter_contact_blocks,
+        mock_get_organisation,
+        single_sms_sender,
+        mock_get_service_settings_page_common,
+):
+    service_one = service_json(
+        SERVICE_ONE_ID,
+        users=[api_user_active['id']],
+        permissions=['broadcast'],
+        organisation_id=ORGANISATION_ID,
+        contact_link='contact_us@gov.uk',
+    )
+    mocker.patch('app.service_api_client.get_service', return_value={'data': service_one})
+
+    client.login(create_platform_admin_user(), mocker, service_one)
+    response = client.get(url_for(
+        'main.service_settings', service_id=SERVICE_ONE_ID
+    ))
+    assert response.status_code == 200
+    page = BeautifulSoup(response.data.decode('utf-8'), 'html.parser')
+    assert page.find('h1').text == 'Settings'
+    rows = page.select('tr')
+
+    expected_rows = [
+        'Label Value Action',
+        'Service name Test Service Change service name',
+        'Sign-in method Text message code Change sign-in method',
+
+        'Label Value Action',
+        'Live Off Change service status',
+        'Notes No notes yet Change the notes for the service',
+        'Email authentication Off Change your settings for Email authentication',
+        'Send cell broadcasts On Change your settings for Send cell broadcasts',
+    ]
+
+    assert len(rows) == len(expected_rows)
+    for index, row in enumerate(expected_rows):
+        assert row == " ".join(rows[index].text.split())
+    app.service_api_client.get_service.assert_called_with(SERVICE_ONE_ID)
+
+
 def test_no_go_live_link_for_service_without_organisation(
     client_request,
     mocker,