Update Pig Latin tests

[VoffieDev]

When I did the Pig Latin exercise about 3 months ago I realized that examples given in the exercise description wasn't tested. These examples included "xray" -> "xrayay", "yttria" -> "yttriaay" & "rhythm" -> "ythmrhay". I believe by adding these tests it will make it more clear what to do as well as connect the exercise description to the tests even more.

If anything is unclear make sure to comment on it and I will try and get back as soon as possible!

[github-actions]

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