Include freebuff prop in chat completions events #5955

Job	Run time
build-and-check	3m 37s
test-integration-packages/internal	1m 31s
test-integration-packages/agent-runtime	46s
test-integration-sdk	1m 35s
test-integration-cli	54s
test-integration-packages/billing	59s
test-integration-web	49s
test-integration-common	47s
test-packages/agent-runtime	43s
test-cli	54s
test-packages/internal	42s
test-web	1m 32s
test-.agents	1m 29s
test-packages/billing	47s
test-common	46s
test-sdk	51s
	18m 42s

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