Continue refactor of pyspark tests (#12007) #313

Job	Run time
Test XGBoost Python package on macos-15-intel	26m 27s
Test installing Python XGBoost from the source distribution (ubuntu-latest)	4m 13s
Test installing Python XGBoost from the source distribution (windows-latest)	7m 51s
Test XGBoost Python package System Installation on Ubuntu	4m 1s
Test installing Python XGBoost from the source distribution (macos-15-intel)	8m 58s
	51m 30s

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