Rework migration role to support (downstream) use of EAP8 #1477

Job	Run time
ci / molecule (3.11, 2.15, default)	3m 10s
ci / linter (3.11, 2.16)	48s
ci / molecule (3.11, 2.15, prospero)	3m 5s
ci / sanity (3.9, stable-2.15)	38s
ci / molecule (3.11, 2.15, yaml_config_validation)	3m 2s
ci / sanity (3.11, stable-2.15)	36s
ci / molecule (3.11, 2.15, install_options)	3m 7s
ci / sanity (3.11, stable-2.16)	31s
ci / molecule (3.11, 2.15, colocated_cluster)	6m 6s
ci / sanity (3.12, milestone)	29s
ci / molecule (3.11, 2.16, default)	3m 29s
ci / sanity (3.12, devel)	28s
ci / molecule (3.11, 2.16, prospero)	3m 5s
ci / molecule (3.11, 2.16, yaml_config_validation)	3m 22s
ci / molecule (3.11, 2.16, install_options)	3m 8s
ci / molecule (3.11, 2.16, colocated_cluster)	5m 50s
	40m 54s

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