Elastic build machines now use Turborepo cache hits to prevent downgrades

Elastic build machines now consider Turborepo cache hits when deciding whether to use a smaller build machine. A warm-cache build no longer triggers a downgrade.

A warm-cache build can use less CPU and memory than the same build with a cold cache. Downgrading based on that lower usage could leave a later cold-cache build without enough resources to complete successfully.

This change applies automatically to all builds using elastic build machines. No action is required. Learn more in the build documentation.