Add package 'pyspark-client' into the RHAI pipeline onboarding collection.

The package builds successfully via the AIPCC self-service pipeline and has a compatible license for redistribution.

Summary

Apache-2.0 is OSI Approved, FSF Libre, and matches the permissive pattern — this classifies as *Low Risk / Highly Compatible*.

License: Apache-2.0
Redistribution Compatible: YES
Reason: Apache-2.0 is a permissive, OSI-approved license that allows free redistribution, modification, and commercial use with minimal obligations (attribution and notice preservation).