Move download_type enum to own type alias #486

Job	Run time
PE 2019.8.12 standard-with-dr on rhel-8 with fips enable	56m 38s
PE 2021.7.9 standard-with-dr on rhel-8 with fips enable	55m 50s
PE 2023.8.0 standard-with-dr on rhel-8 with fips enable	1h 6m 7s
PE 2019.8.12 large on rhel-8 with fips enable	38m 43s
PE 2021.7.9 large on rhel-8 with fips enable	42m 59s
PE 2023.8.0 large on rhel-8 with fips enable	46m 43s
PE 2019.8.12 extra-large-with-dr on rhel-8 with fips enable	1h 18m 45s
PE 2021.7.9 extra-large-with-dr on rhel-8 with fips enable	1h 17m 44s
PE 2023.8.0 extra-large-with-dr on rhel-8 with fips enable	1h 35m 46s
	9h 19m 15s

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