Add tests for serializing lists of dictionary encoded values to json #5399
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Which issue does this PR close?
Related to #5314
Rationale for this change
Lists of dictionary encoded values were not supported in arrow-json 50.0 and returned a "not supported" error. While investigating I wondered why I could not reproduce the issue and realized it was already fixed on the master branch. This adds two test cases showcasing the support.
What changes are included in this PR?
Only tests, no user-facing change
Are there any user-facing changes?