main: make error messages more accurate #1356

Job	Run time
integration test	1m 55s
check commits	1m 56s
frontend tests on ubuntu-latest	2m 7s
backend build on ubuntu-latest	1m 51s
frontend tests on windows-latest	10m 3s
backend build on windows-latest	1m 55s
lint	0s
frontend tests on macOS-latest	4m 5s
RPC proto compilation check	3m 48s
backend build on macOS-latest	2m 5s
unit tests	1m 55s
unit-race	2m 31s
	34m 11s

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