fix: add organization_name to authorization membership test fixtures

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: gjtorikian

tests/utils/fixtures/mock_organization_membership.py

@@ -24,6 +24,7 @@ def __init__(
                     id="om_01ABC",
                     user_id="user_123",
                     organization_id="org_456",
+                    organization_name="Foo Corp",
                     status="active",
                     directory_managed=False,
                     created_at="2024-01-01T00:00:00Z",
@@ -34,6 +35,7 @@ def __init__(
                     id="om_01DEF",
                     user_id="user_789",
                     organization_id="org_456",
+                    organization_name="Foo Corp",
                     status="active",
                     directory_managed=False,
                     created_at="2024-01-02T00:00:00Z",