Added posterior_transform to posterior method in ApproximateGPyTorchModel #4880

Job	Run time
Tests (conda, ubuntu-latest)	7m 57s
Tests (conda, ubuntu-latest)	7m 55s
Tests (conda, macos-14)	11m 14s
Tests (conda, macos-14)	11m 9s
Tests (conda, windows-latest)	13m 43s
Tests (conda, windows-latest)	13m 16s
Test & Coverage (pip) / Tests and coverage (pip, Python 3.10, ubuntu-latest)	9m 25s
Test & Coverage (pip) / Tests and coverage (pip, Python 3.12, ubuntu-latest)	10m 7s
Test & Coverage (pip) / Tests and coverage (pip, Python 3.10, macos-14)	7m 16s
Test & Coverage (pip) / Tests and coverage (pip, Python 3.12, macos-14)	6m 58s
Test & Coverage (pip) / Tests and coverage (pip, Python 3.10, windows-latest)	12m 10s
Test & Coverage (pip) / Tests and coverage (pip, Python 3.12, windows-latest)	12m 25s
	2h 3m 35s

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