NIFI-14405 Add capability to create dedicated Parameter Contexts when creating Process Group from file

[buczi]

Summary

NIFI-14405
Some time ago improvement was added which allowed to copy Parameter Contexts for imported flows from Registries. In this PR I added a checkbox for view in which user configures Process Group imported from json template. On the backend this feature uses the same approach as this PR to copy Parameter Contexts.

I used similar manual testing scenarios as described in the comments of NIFI-11706.

Please let me know if the documentation should also be updated, when I looked at the current version of the docs, I couldn't find a place where I should put any mentions of this change.

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  • JDK 21

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