[formrecognizer] Adding tests for the reading order kwarg

[catalinaperalta]

Fixes #16780

[catalinaperalta]

FYI this is the issue for next sprint for discussing the naming for reading_order options #17688

[iscai-msft]

[kristapratico]

Did we already add reading_order to the client code?

[catalinaperalta]

Did we already add reading_order to the client code?

I just checked, I did not add this earlier. Adding it now!

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[kristapratico]

🚀