NIFI-11621: Handle the case of CHOICE fields when inferring the type …

[markap14]

…of ARRAY elements. E.g., support ARRAY<CHOICE<STRING, NULL>>

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NIFI-00000

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[mattyb149]

Reviewing...

[mattyb149]

+1 LGTM, tested various nested array scenarios, all were inferred correctly. Thanks for the fix! Merging to 1.x and main