fix: Add PipelineVariable support to ModelTrainer fields (fixes #5524) #348

Job	Run time
collab-check	3s
wait-for-approval	3s
detect-changes	10s
integ-tests (sagemaker-serve)	33m 27s
codestyle-doc-tests (sagemaker-train)	4m 40s
integ-tests (sagemaker-train)	1h 13m 17s
codestyle-doc-tests (sagemaker-mlops)	6m 12s
integ-tests (sagemaker-mlops)	31m 4s
unit-tests (sagemaker-train)	30m 36s
unit-tests (sagemaker-mlops)	30m 54s
codestyle-doc-tests (sagemaker-serve)	6m 29s
unit-tests (sagemaker-serve)	46m 59s
	4h 23m 54s

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