Make people sign in to get the agreement

Currently we have a bunch of users who aren’t signed in asking us for
the agreement.

This is bad because:
- it’s slower (for them) than just being able to download it
- it creates work for us

We can’t just offer the agreement to anyone, but we can offer to it to
anyone who’s signed in because we now let people self-select which
version to download when we can’t tell which one to give them.

tests/app/main/views/test_feedback.py

@@ -88,16 +88,8 @@ def test_get_feedback_page(client, ticket_type, expected_status_code):
     (
         'agreement',
         (
-            'Please send me a copy of the GOV.UK Notify data sharing '
-            'and financial agreement.'
-        )
-    ),
-    (
-        'agreement-with-owner',
-        (
-            'Please send me a copy of the GOV.UK Notify data sharing '
-            'and financial agreement for Marine Management '
-            'Organisation to sign.'
+            'Please can you tell me if there’s an agreement in place '
+            'between GOV.UK Notify and my organisation?'
         )
     ),
     (