Add chat completion concurrency logging (#733) #6734

Job	Run time
build-and-check	2m 53s
test-integration-packages/billing	1m 6s
test-integration-packages/internal	1m 2s
test-integration-cli	46s
test-integration-sdk	1m 22s
test-integration-web	41s
test-integration-packages/agent-runtime	43s
test-integration-common	45s
test-cli	55s
test-packages/internal	58s
test-.agents	43s
test-common	45s
test-packages/billing	51s
test-sdk	42s
test-web	57s
test-packages/agent-runtime	42s
	15m 51s

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