Evaluate 1ES pre-provisioning feature for build pools

To reduce wait times in our build pools, we can use 1ES pre-provisioning feature to have machines waiting for builds to start.

We will call this epic done when have answers for the following questions:
- How much wait times are reduced?
- How much more money do we have to pay for pre-provisioning?
- How does pre-provisioning handle different images in the pool?

Ideas:
- We can use our COGS pools where we don't have a budget to answer the questions above