Refactor dead code - Removing all `flash_xxx.py` files. #228

Job	Run time
build (cuda) / build-and-push	5m 24s
build (intel) / build-and-push	13s
build (rocm) / build-and-push	5m 38s
build (intel) / integration_tests	0s
build (cuda) / integration_tests	0s
build (rocm) / integration_tests	0s
	11m 15s

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