[codex] Disable CLI diff rendering #6468

Job	Run time
build-and-check	2m 55s
test-integration-packages/internal	1m 6s
test-integration-packages/billing	1m 13s
test-integration-web	44s
test-integration-packages/agent-runtime	52s
test-integration-cli	44s
test-integration-sdk	1m 17s
test-integration-common	58s
test-packages/internal	49s
test-packages/agent-runtime	46s
test-.agents	39s
test-cli	1m 1s
test-sdk	53s
test-packages/billing	40s
test-web	1m 19s
test-common	46s
	16m 42s

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