Add the remaining unit tests for V2 and V3 deserializers about openapi.net HOT 3 CLOSED

@PerthCharern Any reason why we are changing from using embedded resources to using file paths for test input files? My experience is that embedded files are much more reliable than depending on a file path that is relative to the working directory of the test runner. Now the CI scripts that run the tests have to worry about making sure the input files are in the right place.

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@darrelmiller Not a strong reason, but I found the syntax for embedded files a bit awkward. Instead of a path, it uses the period notation. I'm not sure if most people are familiar with using embedded files this way, but I might be completely wrong on this.

I'm not sure what you meant by "Now the CI scripts that run the tests have to worry about making sure the input files are in the right place." Aren't this handled by the way we structure the files in the code base?

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I understand the concerns now. Let's track this embedded file problem in a separate issue.

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