fix backend unit tests #3928

Job	Run time
build-and-check	2m 22s
test-cli	33s
test-backend	43s
test-packages/agent-runtime	37s
test-integration-backend	40s
test-common	30s
test-npm-app	34s
test-.agents	34s
test-web	37s
test-integration-common	37s
test-integration-.agents	34s
test-integration-packages/agent-runtime	33s
test-integration-npm-app	29s
test-integration-web	33s
test-integration-cli	31s
	10m 27s

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