[7.16] [ML] Model snapshot upgrade needs a stats endpoint #81706
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Previously the ML model snapshot upgrade endpoint did not
provide a way to reliably monitor progress. This could lead
to the upgrade assistant UI thinking that a model snapshot
upgrade had finished when it actually hadn't.
This change adds a new "stats" API that allows external
interested parties to find out the status of each model
snapshot upgrade and which node (if any) each is running on.
Backport of #81641