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## Problem - In https://github.com/neondatabase/neon/pull/8784, the validate controller API is modified to check generations directly in the database. It batches tenants into separate queries to avoid generating a huge statement, but - While updating this, I realized that "control_plane_client" is a kind of confusing name for the client code now that it primarily talks to the storage controller (the case of talking to the control plane will go away in a few months). ## Summary of changes - Big rename to "ControllerUpcallClient" -- this reflects the storage controller's api naming, where the paths used by the pageserver are in `/upcall/` - When sending validate requests, break them up into chunks so that we avoid possible edge cases of generating any HTTP requests that require database I/O across many thousands of tenants. This PR mixes a functional change with a refactor, but the commits are cleanly separated -- only the last commit is a functional change. --------- Co-authored-by: Christian Schwarz <christian@neon.tech>