fix admin add/remove role (#16103)

ref: https://python-software-foundation.sentry.io/share/issue/cb265f308f8e4e7f8d772bbf19678e7d/

Author: ewdurbin

tests/unit/admin/views/test_projects.py

@@ -749,6 +749,7 @@ class TestAddRole:
     def test_add_role(self, db_request):
         role_name = "Maintainer"
         project = ProjectFactory.create(name="foo")
+        UserFactory.create(username="admin")
         user = UserFactory.create(username="bar")
 
         db_request.route_path = pretend.call_recorder(lambda *a, **kw: "/the-redirect/")
@@ -843,6 +844,7 @@ def test_delete_role(self, db_request):
         project = ProjectFactory.create(name="foo")
         user = UserFactory.create(username="bar")
         role = RoleFactory.create(project=project, user=user)
+        UserFactory.create(username="admin")
 
         db_request.route_path = pretend.call_recorder(lambda *a, **kw: "/the-redirect/")
         db_request.session = pretend.stub(

warehouse/admin/views/projects.py

@@ -609,7 +609,7 @@ def add_role(project, request):
         tag=EventTag.Project.RoleAdd,
         request=request,
         additional={
-            "submitted_by": user_service.get_admin_user(),
+            "submitted_by": user_service.get_admin_user().username,
             "role_name": role_name,
             "target_user": user.username,
         },
@@ -618,7 +618,7 @@ def add_role(project, request):
         tag=EventTag.Account.RoleAdd,
         request=request,
         additional={
-            "submitted_by": user_service.get_admin_user(),
+            "submitted_by": user_service.get_admin_user().username,
             "project_name": project.name,
             "role_name": role_name,
         },
@@ -678,7 +678,7 @@ def delete_role(project, request):
         tag=EventTag.Project.RoleRemove,
         request=request,
         additional={
-            "submitted_by": user_service.get_admin_user(),
+            "submitted_by": user_service.get_admin_user().username,
             "role_name": role.role_name,
             "target_user": role.user.username,
         },