main: make error messages more accurate #1353

Job	Run time
integration test	7m 49s
check commits	27s
frontend tests on ubuntu-latest	2m 10s
backend build on ubuntu-latest	2m 49s
frontend tests on windows-latest	8m 22s
lint	0s
backend build on windows-latest	13m 33s
frontend tests on macOS-latest	4m 39s
RPC proto compilation check	3m 52s
backend build on macOS-latest	10m 3s
unit tests	25s
unit-race	23s
	54m 32s

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