Fix up directory-lister to have more concise output #4117

Job	Run time
build-and-check	2m 39s
test-integration-cli	49s
test-integration-packages/agent-runtime	47s
test-integration-web	41s
test-integration-npm-app	40s
test-integration-.agents	41s
test-integration-common	42s
test-integration-backend	44s
test-.agents	44s
test-web	49s
test-packages/agent-runtime	53s
test-cli	54s
test-backend	41s
test-npm-app	51s
test-common	42s
	13m 17s

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