Restore CLI diff viewer #6500

Job	Run time
build-and-check	3m 4s
test-integration-packages/internal	1m 13s
test-integration-packages/billing	1m 20s
test-integration-cli	47s
test-packages/agent-runtime	42s
test-integration-web	43s
test-integration-common	50s
test-integration-sdk	1m 14s
test-packages/billing	44s
test-cli	1m 0s
test-sdk	41s
test-web	1m 10s
test-common	49s
test-integration-packages/agent-runtime	39s
test-.agents	40s
test-packages/internal	49s
	16m 25s

Provide feedback