feat(spec,service-automation,lint)!: an http node's url and headers are text slots, its body a value slot, the rest literals — the {…} token refused (#19939 pass 4, S5)

feat(spec,service-automation,lint)!: an http node's url and headers are text slots, its body a value slot, the rest literals — the {…} token refused (#19939 pass 4, S5) #18635