ci : use new 1vCPU runner for lightweight jobs (#19107) #94

Job	Run time
server-windows	13m 21s
server (ADDRESS, RelWithDebInfo)	5m 32s
server (UNDEFINED, RelWithDebInfo)	5m 54s
server (Release)	10m 45s
server (Release, LLAMA_ARG_BACKEND_SAMPLING=1)	11m 12s
	46m 44s

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