Gate preinstall logic behind "python" feature #12679

Job	Run time
build	11m 38s
build_ee	13m 19s
build_ee_312	0s
build_slim	0s
build_full	0s
run_integration_test	3m 35s
build_ee_nsjail	1m 45s
attach_amd64_binary_to_release	0s
build_ee_cuda	0s
build_ee_full	0s
build_ee_slim	0s
build_ee_reports_privately	30s
publish_ecr_s3	1m 46s
tag_latest	0s
tag_latest_ee	0s
verify_ee_image_vulnerabilities	0s
	32m 33s

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