[formrecognizer] Re-enable prod tests

[catalinaperalta]

Re-enable once the service issues have been resolved.

[benbp]

FYI @witemple-msft @kinelski do you know is there a corresponding issue for js/net to make sure we don't lose track of this?

[kinelski]

@benbp Just created one Azure/azure-sdk-for-net#25358 for .NET