Feature to label *all* resources on Iris deployment

[JoshuaFox]

Add a feature that labels all resources--but only once.

Today you can do that with Cloud Scheduler, but after the first mass-labeling, we usually do not want to do it again because then we are spending money on reading the same labels daily.

This could be done by using curl on a new endpoint /label_all_resources at the end of the deployment script.

This endpoint would just do the same as /schedule but on all resource types.