Use labels and single gate configuration for all DB validations #340

Job	Run time
Build snapshot artifacts	9m 19s
Static analysis	29s
Unit tests (Python)	20s
Discover supported schema versions	3s
Unit tests (Go)	2m 40s
Acceptance tests (1)	23s
Acceptance tests (2)	22s
Acceptance tests (3)	25s
Acceptance tests (4)	23s
Acceptance tests (5)	24s
CLI tests (Python)	0s
CLI tests (Go-Linux)	1m 52s
	16m 40s

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