🐛(tests) fix flaky back-end test

fixed a test that would fail because of random auth user name being
too close to tested names (assert would find 2 results instead of 1).
Setting the name of auth user should fix the issue permanently.

src/backend/core/tests/contacts/test_core_api_contacts_list.py

@@ -100,7 +100,7 @@ def test_api_contacts_list_authenticated_by_full_name():
     Authenticated users should be able to search users with a case insensitive and
     partial query on the full name.
     """
-    user = factories.UserFactory()
+    user = factories.UserFactory(name="Prudence Crandall")
 
     dave = factories.BaseContactFactory(full_name="David Bowman")
     nicole = factories.BaseContactFactory(full_name="Nicole Foole")