NIFI-16051 Propagate logging attributes down the process group tree

[boguszj]

Summary

NIFI-16051

Propagating the logging attributes down solves 2 issues:

• missing registeredFlowIdentifierPath when flow is first imported from the registry
• lack of registeredFlowIdentifierPath propagation down to the children when VCI changes on the root PG

Technically, the 1st issue could probably be fixed in the initialization process itself, but propagation fixes both & makes sure they are always synchronized.

Additionally moving from a mutating the map, to overriding with an immutable instance would make sure there are no partial reads.

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Build

• Build completed using ./mvnw clean install -P contrib-check
  • JDK 21
  • JDK 25