pkg/aflow: keep LLM reply on tool calls #19115

Job	Run time
race_dashboard	3m 50s
dashboard	2m 11s
gvisor	4m 1s
build	4m 7s
aux	3m 59s
old	4m 9s
race	4m 20s
arch (presubmit_arch_freebsd)	4m 11s
arch (presubmit_arch_netbsd)	4m 0s
arch (presubmit_arch_openbsd)	3m 48s
arch (presubmit_arch_darwin)	3m 46s
arch (presubmit_arch_linux)	4m 10s
arch (presubmit_arch_windows)	3m 36s
arch (presubmit_arch_executor)	3m 18s
	53m 26s

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