Clean up ingester client inflightPushRequests on close (#5932) #8924

Job	Run time
test	17m 37s
CodeQL	7m 16s
lint	15m 28s
build	3m 51s
integration-configs-db	2m 14s
integration (requires_docker)	5m 37s
integration (integration_alertmanager)	4m 2s
integration (integration_backward_compatibility)	9m 14s
integration (integration_memberlist)	7m 22s
integration (integration_querier)	11m 53s
integration (integration_ruler)	4m 10s
integration (integration_query_fuzz)	2m 24s
deploy_website	46s
deploy	3m 25s
	1h 35m 19s

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