Clean up ingester client inflightPushRequests on close #8922

Job	Run time
lint	15m 35s
build	4m 8s
test	17m 43s
CodeQL	6m 27s
integration-configs-db	2m 9s
integration (requires_docker)	5m 44s
integration (integration_alertmanager)	3m 59s
integration (integration_backward_compatibility)	8m 43s
integration (integration_memberlist)	7m 39s
integration (integration_querier)	11m 45s
integration (integration_ruler)	4m 2s
integration (integration_query_fuzz)	2m 30s
deploy	0s
deploy_website	0s
	1h 30m 24s

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