fix: remove model_def_script from AtomicModel #6378

Job	Run time
Build source distribution	23s
determine-arm64-runner	1s
Build wheels for cp311-manylinux_x86_64	6m 34s
Build wheels for cp311-manylinux_x86_64	5m 37s
Build wheels for cp311-macosx_x86_64	7m 34s
Build wheels for cp311-macosx_arm64	3m 17s
Build wheels for cp311-win_amd64	5m 55s
Build wheels for cp310-manylinux_aarch64	5m 21s
build_pypi_index	12s
build_docker (12)	3m 36s
build_docker (_cu11, 11)	4m 3s
upload_pypi	0s
deploy_pypi_index	0s
Pass testing build wheels	2s
	42m 35s

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