Use update-prometheus-3.0 branch #15905

Job	Run time
Check misspelled words	11s
Go build for different platforms	9m 26s
Linters (Static Analysis) for Go	1m 57s
Thanos unit tests	6m 59s
Go build with -tags=stringlabels	1m 24s
Thanos end-to-end tests (8, 0)	3m 58s
Thanos end-to-end tests (8, 1)	3m 48s
Thanos end-to-end tests (8, 2)	3m 50s
Thanos end-to-end tests (8, 3)	3m 51s
Thanos end-to-end tests (8, 4)	4m 1s
Thanos end-to-end tests (8, 5)	3m 52s
Thanos end-to-end tests (8, 6)	3m 55s
Thanos end-to-end tests (8, 7)	3m 50s
	51m 2s

Provide feedback