Add back source validation with context patch with deprecation notice #546

Job	Run time
unit_tests (3.7)	6m 56s
unit_tests (3.8)	7m 46s
unit_tests (3.9)	6m 59s
docker_build_tests / docker_build_tests	5m 13s
py_build_tests / py_build_tests	8s
py_build_tests / relative_path_tests	10s
	27m 12s

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