NIFI-14944 - Fix flow upgrade when CS reference goes from external to scoped controller service

[pvillard31]

Summary

NIFI-14944 - Fix flow upgrade when CS reference goes from external to scoped controller service

Current situation:

• Considering a versioned flow PG1 containing GenerateFlowFile -> ConvertRecord -> UpdateAttribute.
• Where, in v1, ConvertRecord references a JSON Reader and JSON Writer defined at root level (external controller services in the versioned flow definition).
• Where, in v2, ConvertRecord references newly created JSON Reader and JSON Writer defined at PG1 level.

Then, when upgrading from v1 to v2, ConvertRecord would still reference the external controller services, which is not expected.

This PR fixes the logic to identify the controller service that should be referenced. A unit test has been added to reproduce the above scenario with versioned flow definitions. I also added another unit test to show that if the processor ConvertRecord is in a nested PG2 process group, then we would still update the referenced controller services to the ones defined in PG1. We basically do a lookup starting in the current process group and then go up to the parent, and so on.

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