store: label_values: fetch less postings #15151

Job	Run time
Go build for different platforms	9m 5s
Go build for different platforms	9m 5s
Check misspelled words	14s
Check misspelled words	14s
Go build with -tags=stringlabels	59s
Go build with -tags=stringlabels	59s
Thanos end-to-end tests (8, 0)	13m 12s
Thanos end-to-end tests (8, 0)	4m 59s
Linters (Static Analysis) for Go	2m 17s
Linters (Static Analysis) for Go	2m 17s
Thanos end-to-end tests (8, 1)	4m 3s
Thanos end-to-end tests (8, 1)	4m 3s
Thanos end-to-end tests (8, 2)	12m 57s
Thanos end-to-end tests (8, 2)	3m 42s
Thanos end-to-end tests (8, 3)	4m 23s
Thanos end-to-end tests (8, 3)	4m 23s
Thanos end-to-end tests (8, 4)	7m 38s
Thanos end-to-end tests (8, 4)	7m 38s
Thanos end-to-end tests (8, 5)	4m 26s
Thanos end-to-end tests (8, 5)	4m 26s
Thanos end-to-end tests (8, 6)	4m 25s
Thanos end-to-end tests (8, 6)	4m 25s
Thanos end-to-end tests (8, 7)	13m 25s
Thanos end-to-end tests (8, 7)	4m 37s
	2h 7m 52s

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