Allow empty matcher at store gateway to fetch all postings #13676

Job	Run time
Go build for different platforms	9m 6s
Go build for different platforms	9m 6s
Go build for different platforms	9m 6s
Linters (Static Analysis) for Go	1m 23s
Linters (Static Analysis) for Go	1m 23s
Linters (Static Analysis) for Go	1m 23s
Thanos end-to-end tests (8, 0)	4m 51s
Thanos end-to-end tests (8, 0)	4m 51s
Thanos end-to-end tests (8, 0)	4m 51s
Thanos end-to-end tests (8, 1)	4m 11s
Thanos end-to-end tests (8, 1)	4m 11s
Thanos end-to-end tests (8, 1)	4m 11s
Thanos end-to-end tests (8, 2)	4m 3s
Thanos end-to-end tests (8, 2)	4m 3s
Thanos end-to-end tests (8, 2)	4m 3s
Thanos end-to-end tests (8, 3)	3m 55s
Thanos end-to-end tests (8, 3)	3m 55s
Thanos end-to-end tests (8, 3)	3m 55s
Thanos end-to-end tests (8, 4)	6m 56s
Thanos end-to-end tests (8, 4)	6m 56s
Thanos end-to-end tests (8, 4)	6m 56s
Thanos end-to-end tests (8, 5)	3m 46s
Thanos end-to-end tests (8, 5)	3m 58s
Thanos end-to-end tests (8, 5)	4m 15s
Thanos end-to-end tests (8, 6)	4m 3s
Thanos end-to-end tests (8, 6)	4m 3s
Thanos end-to-end tests (8, 6)	4m 3s
Thanos end-to-end tests (8, 7)	3m 47s
Thanos end-to-end tests (8, 7)	3m 47s
Thanos end-to-end tests (8, 7)	3m 47s
	2h 18m 44s

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