[PW-4723] Make error_details column nullable for Shopware 5 notification

[ataberkylmz]

Summary

We can see the below log/issue if the errorDetails key is null in the notification (which can happen with PayPal):

array (
  'error' => 'An exception occurred while executing \'INSERT INTO s_plugin_adyen_order_notification (order_id, psp_reference, created_at, updated_at, status, paymentMethod, event_code, success, merchant_account_code, amount_value, amount_currency, error_details) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)\' with params [171, "155xxxx075", "2021-05-21 13:45:01", "2021-05-21 13:45:01", "received", "paypal", "CAPTURE", 1, "XXX", 4417, "EUR", null]:
SQLSTATE[23000]: Integrity constraint violation: 1048 Column \'error_details\' cannot be null',
)