Add additional params to get notifications client

We want to show a log of notifications that have been sent from the API.

The admin app uses its own private `/service/…/notifications` endpoint
for listing activity. This commit allows us to pass through two
optional, additional parameters to tell the API to:

- include or not include notifications created from a job
- include or not include notifications created with a test API key

tests/app/notify_client/test_notification_client.py

@@ -25,6 +25,14 @@ def test_client_gets_notifications_with_page(mocker):
         {'page': 99},
         {'url': '/service/abcd1234/notifications', 'params': {'page': 99}}
     ),
+    (
+        {'include_jobs': False},
+        {'url': '/service/abcd1234/notifications', 'params': {'include_jobs': False}}
+    ),
+    (
+        {'include_from_test_key': True},
+        {'url': '/service/abcd1234/notifications', 'params': {'include_from_test_key': True}}
+    ),
     (
         {'job_id': 'efgh5678'},
         {'url': '/service/abcd1234/job/efgh5678/notifications', 'params': {}}