Remove obsolete state migration step in AM #8199

Job	Run time
build	3m 45s
build	3m 45s
test	18m 6s
test	17m 57s
lint	16m 10s
lint	16m 10s
integration (requires_docker)	4m 57s
integration (requires_docker)	4m 57s
integration-configs-db	1m 51s
integration-configs-db	1m 51s
integration (integration_alertmanager)	3m 51s
integration (integration_alertmanager)	3m 51s
integration (integration_backward_compatibility)	8m 35s
integration (integration_backward_compatibility)	7m 31s
integration (integration_memberlist)	7m 2s
integration (integration_memberlist)	7m 2s
integration (integration_querier)	12m 47s
integration (integration_querier)	12m 47s
integration (integration_ruler)	3m 34s
integration (integration_ruler)	3m 34s
integration (integration_query_fuzz)	1m 49s
integration (integration_query_fuzz)	1m 49s
deploy_website	0s
deploy_website	0s
deploy	0s
deploy	0s
	2h 43m 41s

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