Receive: fix issue-7248 with parallel receive_forward #13736

Job	Run time
Go build for different platforms	8m 30s
Thanos end-to-end tests (8, 0)	5m 35s
Linters (Static Analysis) for Go	3m 20s
Thanos end-to-end tests (8, 1)	4m 35s
Thanos end-to-end tests (8, 2)	4m 58s
Thanos end-to-end tests (8, 3)	5m 9s
Thanos end-to-end tests (8, 4)	8m 10s
Thanos end-to-end tests (8, 5)	5m 0s
Thanos end-to-end tests (8, 6)	5m 22s
Thanos end-to-end tests (8, 7)	4m 55s
	55m 34s

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