main: make error messages more accurate #1358

Job	Run time
check commits	25s
frontend tests on ubuntu-latest	2m 14s
integration test	7m 44s
frontend tests on windows-latest	8m 12s
backend build on ubuntu-latest	2m 37s
frontend tests on macOS-latest	5m 18s
lint	0s
backend build on windows-latest	14m 16s
RPC proto compilation check	3m 29s
backend build on macOS-latest	11m 35s
unit tests	20s
unit-race	24s
	56m 34s

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