List calendar connections

{
    "connections": [
        {
            "id": "8f1c2b3a-0000-4d5e-9abc-1234567890ab",
            "tenant_id": "1a2b3c4d-0000-4e5f-8a9b-abcdef012345",
            "provider": "google",
            "account_email": "booking@example.no",
            "account_name": "Example AS",
            "scopes": [
                "calendar",
                "calendar.events"
            ],
            "is_active": true,
            "token_expires_at": "2026-06-25T12:00:00.000Z",
            "updated_at": "2026-06-25T10:00:00.000Z"
        }
    ]
}