[sql-8]: run itests against all DB types #2019

Job	Run time
frontend tests on ubuntu-latest	2m 18s
frontend tests on windows-latest	15m 36s
frontend tests on macOS-latest	2m 28s
check commits	6m 0s
backend build on ubuntu-latest	8m 59s
integration test (bbolt, dbbackend=bbolt)	19m 49s
backend build on windows-latest	17m 14s
integration test (sqlite, dbbackend=sqlite)	14m 3s
backend build on macOS-latest	7m 8s
lint	5m 27s
integration test (postgres, dbbackend=postgres)	16m 32s
RPC proto compilation check	6m 37s
Sqlc check	46s
run unit tests (unit-race)	3m 59s
check release notes updated	0s
run unit tests (unit)	5m 2s
run unit tests (unit dbbackend=postgres)	3m 10s
run unit tests (unit dbbackend=sqlite)	2m 34s
	2h 17m 42s

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