feat: add stop condition to model customization trainers #281

Job	Run time
collab-check	5s
wait-for-approval	4s
detect-changes	9s
unit-tests (sagemaker-mlops)	28m 24s
codestyle-doc-tests (sagemaker-serve)	6m 29s
unit-tests (sagemaker-serve)	43m 34s
integ-tests (sagemaker-mlops)	21m 19s
codestyle-doc-tests (sagemaker-mlops)	5m 41s
codestyle-doc-tests (sagemaker-train)	6m 45s
integ-tests (sagemaker-train)	53m 1s
unit-tests (sagemaker-train)	30m 9s
integ-tests (sagemaker-serve)	32m 6s
	3h 47m 46s

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