add context timeout for waitInstanceState call for alertmanager and s… #7826

Job	Run time
lint	6m 14s
build	6m 1s
test	33m 35s
integration-configs-db	2m 52s
integration (requires_docker)	6m 39s
integration (integration_alertmanager)	4m 54s
integration (integration_backward_compatibility)	10m 9s
integration (integration_memberlist)	9m 3s
integration (integration_querier)	15m 29s
integration (integration_ruler)	4m 32s
integration (integration_query_fuzz)	3m 41s
deploy_website	0s
deploy	0s
	1h 43m 9s

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