fix backend unit tests #3997

Job	Run time
build-and-check	2m 32s
test-integration-.agents	37s
test-integration-cli	34s
test-.agents	31s
test-integration-backend	32s
test-integration-npm-app	31s
test-common	29s
test-npm-app	34s
test-integration-web	32s
test-cli	30s
test-integration-packages/agent-runtime	30s
test-integration-common	31s
test-web	36s
test-packages/agent-runtime	40s
test-backend	40s
	10m 19s

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