Add compact chat completion trace fetcher (#716) #6700

Job	Run time
build-and-check	2m 58s
test-integration-packages/internal	1m 0s
test-integration-packages/billing	1m 11s
test-integration-cli	42s
test-integration-packages/agent-runtime	45s
test-integration-web	39s
test-integration-sdk	1m 15s
test-integration-common	41s
test-packages/internal	52s
test-web	57s
test-packages/billing	43s
test-cli	51s
test-packages/agent-runtime	41s
test-common	52s
test-.agents	45s
test-sdk	51s
	15m 43s

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