Add chat completion concurrency logging #6731

Job	Run time
build-and-check	2m 45s
test-integration-packages/billing	1m 6s
test-integration-packages/internal	1m 11s
test-integration-sdk	1m 28s
test-integration-common	39s
test-integration-cli	39s
test-integration-packages/agent-runtime	40s
test-integration-web	40s
test-cli	52s
test-packages/agent-runtime	44s
test-common	50s
test-sdk	49s
test-packages/internal	50s
test-packages/billing	43s
test-web	1m 55s
test-.agents	40s
	16m 31s

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