[FormRecognizer] Service returning 'expirationDateTime' on 2022-08-31

[kinelski]

The latest Form Recognizer service preview (version 2023-02-28-preview) introduced a new property to some models: expirationDateTime. This new property is accidently being returned in an older service version: 2022-08-31, which is causing some of our tests to fail.

The service team has already been notified about this and a fix is expected to be rolled out in a couple of days.

Meanwhile, we have updated the validation in our tests to match the current behavior of the service. Affected validation methods are: AdministrationOperationsLiveTests.ValidateDocumentModelDetails and DocumentModelAdministrationLiveTests.BuildDocumentModel.

Once the service has fixed the issue, tests need to be updated again to reflect the expected behavior.

Important update: the service fixed the issue in calls to GetDocumentModel and GetDocumentModels, but it's still present in GetOperation. This caused new failures in tests DocumentModelAdministrationLiveTests.GetDocumentModel and DocumentModelAdministrationLiveTests.GetDocumentModels, so more assertions were commented out. These need to be updated as well once the service fixes the issue.