pkg/aflow: keep LLM reply on tool calls #19112

Job	Run time
race_dashboard	2m 55s
race	9m 26s
old	7m 24s
build	4m 18s
dashboard	2m 0s
gvisor	4m 12s
arch (presubmit_arch_linux)	11m 8s
arch (presubmit_arch_darwin)	3m 59s
aux	3m 51s
arch (presubmit_arch_windows)	3m 39s
arch (presubmit_arch_executor)	3m 24s
arch (presubmit_arch_freebsd)	6m 33s
arch (presubmit_arch_openbsd)	4m 6s
arch (presubmit_arch_netbsd)	3m 56s
	1h 10m 51s

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