Use labels and single gate configuration for all DB validations #344

Job	Run time
Unit tests (Go)	3m 42s
Build snapshot artifacts	8m 4s
Discover supported schema versions	4s
Unit tests (Python)	46s
Static analysis	4m 58s
Acceptance tests (1)	3m 31s
Acceptance tests (2)	3m 28s
Acceptance tests (3)	3m 32s
Acceptance tests (4)	3m 28s
Acceptance tests (5)	3m 21s
CLI tests (Python)	0s
CLI tests (Go-Linux)	2m 25s
	37m 19s

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