fix: new expiry logic and error codes for enrollments #3387

Job	Run time
functional_tests	2m 20s
unit_tests	3m 34s
end2end_test_prep	1m 56s
end2end_test_staging	5m 16s
end2end_test_56	2m 51s
end2end_test_34	3m 3s
end2end_test_12	3m 3s
push_canary_secondary_image	0s
push_prod_virtualenv_image	0s
push_canary_virtualenv_image	0s
push_prod_secondary_image	0s
push_staging_observable_secondary_image	0s
push_staging_secondary_image	0s
push_staging_virtual_env_images	0s
	22m 3s

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