add context timeout for waitInstanceState call for alertmanager and s… #7829

Job	Run time
lint	6m 49s
test	28m 49s
build	5m 53s
integration-configs-db	2m 53s
integration (requires_docker)	6m 33s
integration (integration_alertmanager)	5m 20s
integration (integration_backward_compatibility)	11m 32s
integration (integration_memberlist)	9m 11s
integration (integration_querier)	14m 19s
integration (integration_ruler)	4m 43s
integration (integration_query_fuzz)	2m 48s
deploy_website	0s
deploy	0s
	1h 38m 50s

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