linter: re-enable the linter #1378

Job	Run time
backend build on ubuntu-latest	4m 46s
backend build on windows-latest	12m 3s
integration test	8m 52s
backend build on macOS-latest	13m 16s
check commits	2m 13s
frontend tests on ubuntu-latest	2m 12s
frontend tests on windows-latest	9m 48s
lint	3m 36s
frontend tests on macOS-latest	6m 30s
RPC proto compilation check	4m 4s
unit tests	27s
unit-race	26s
	1h 8m 13s

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