Rework migration role to support (downstream) use of EAP8 #1466

Job	Run time
ci / linter (3.11, 2.16)	49s
ci / sanity (3.9, stable-2.15)	35s
ci / molecule (3.11, 2.15, default)	3m 11s
ci / sanity (3.11, stable-2.15)	41s
ci / molecule (3.11, 2.15, prospero)	3m 10s
ci / sanity (3.11, stable-2.16)	30s
ci / molecule (3.11, 2.15, yaml_config_validation)	3m 8s
ci / sanity (3.12, milestone)	29s
ci / sanity (3.12, devel)	34s
ci / molecule (3.11, 2.15, install_options)	3m 13s
ci / molecule (3.11, 2.15, colocated_cluster)	6m 28s
ci / molecule (3.11, 2.16, default)	3m 25s
ci / molecule (3.11, 2.16, prospero)	3m 5s
ci / molecule (3.11, 2.16, yaml_config_validation)	3m 5s
ci / molecule (3.11, 2.16, install_options)	2m 57s
ci / molecule (3.11, 2.16, colocated_cluster)	6m 0s
	41m 20s

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