[NIFI-7882] Handle JsonProperties as avro field default

[alien11689]

Fixes NIFI-7882

[MikeThomsen]

Avro 1.10.0 is using Jackson 2 now, so it would be worthwhile to check a new Avro build to see if the behavior is the same.

[alien11689]

Bumping Avro to 1.9 or 1.10 is one of the available solutions, but it definitely should bump nifi minor version (1.12 -> 1.13). And of course it should be done.

But for fixing the problem as soon as possible this change is good enough. Nifi version could be bumped only with patch version and versions 1.11.5 and 1.12.2 could be released.

[mattyb149]

Code LGTM but the test input/output files appear to have Windows-style line endings. Could you ensure the changed lines and new files have Unix-style line endings? Should be ready to merge after that.

[alien11689]

Hi, I set Unix-style file endings for new files.

[github-actions]

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