tests: Use /some/random/endpoint in a few places.

When we are just building lots of UserActivity
records to simulate user activity, it's misleading
to use some specific endpoint that people reading
the test may think is pertinent to the actual
test.

The pointer endpoints that I replaced in this
commit are a good example of this principle--
they will no longer exist in an upcoming commit,
but these tests would have kept running and be
even more confusing.

zerver/tests/test_soft_deactivation.py

@@ -60,7 +60,7 @@ class UserSoftDeactivationTests(ZulipTestCase):
             self.example_user('desdemona'),
         ]
         client, _ = Client.objects.get_or_create(name='website')
-        query = '/json/users/me/pointer'
+        query = '/some/random/endpoint'
         last_visit = timezone_now()
         count = 150
         for user_profile in UserProfile.objects.all():
@@ -167,7 +167,7 @@ class UserSoftDeactivationTests(ZulipTestCase):
             self.subscribe(user, stream_name)
 
         client, _ = Client.objects.get_or_create(name='website')
-        query = '/json/users/me/pointer'
+        query = '/some/random/endpoint'
         last_visit = timezone_now()
         count = 150
         for user_profile in users: