NIFI-14007 Add ACL entities to GCS Processor FlowFile attributes.

[alexethier]

Add GCS file's ACL identities and roles to ListGCSBucket and FetchGCSObject processor's FlowFile Attribute output.

Summary

NIFI-14007

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Build

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• JDK 21

[exceptionfactory]

Thanks for the improvement @alexethier. This looks like a helpful change, but several GCS unit tests are now failing, so those need to be addressed.

[alexethier]

@exceptionfactory oops my bad! I've added unit tests and fixed the erroring ones.

[exceptionfactory]

Thanks for updating the unit tests @alexethier, the latest version looks good! +1 merging