Rework migration role to support (downstream) use of EAP8 #1472

Job	Run time
ci / linter (3.11, 2.16)	34s
ci / sanity (3.9, stable-2.15)	38s
ci / molecule (3.11, 2.15, default)	3m 23s
ci / sanity (3.11, stable-2.15)	35s
ci / molecule (3.11, 2.15, prospero)	3m 17s
ci / sanity (3.11, stable-2.16)	37s
ci / molecule (3.11, 2.15, yaml_config_validation)	3m 22s
ci / sanity (3.12, milestone)	28s
ci / molecule (3.11, 2.15, install_options)	2m 57s
ci / sanity (3.12, devel)	33s
ci / molecule (3.11, 2.15, colocated_cluster)	6m 11s
ci / molecule (3.11, 2.16, default)	3m 14s
ci / molecule (3.11, 2.16, prospero)	3m 3s
ci / molecule (3.11, 2.16, yaml_config_validation)	3m 10s
ci / molecule (3.11, 2.16, install_options)	3m 13s
ci / molecule (3.11, 2.16, colocated_cluster)	5m 55s
	41m 10s

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