[8.x] Backport "ESQL: CATEGORIZE as a BlockHash" #117699
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ivancea
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Fix #117770 Fix #117784 #117699 made changes to how we plan aggregations which were supposed to only trigger when a query contained a `CATEGORIZE`, but accidentally changed a code path that seems to only be required for interoperability with pre-8.13 nodes. Because of this, we didn't notice failing tests until the periodic bwc tests ran. The code this PR fixes addresses situations where `Aggregate` plan nodes contained _aliases inside the aggregates_. On `main` and `8.x`, this is effectively an illegal state: since #104958, aliases in the aggregates become `Eval` nodes before and after the `Aggregate` node. But here, on 8.x, we'll just fix this code path so that it behaves exactly as before #117699. If this passes the full-bwc test, I plan to forward-port this by removing the obsolete code path on `main`.
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Manual 8.x backport of #114317
Auto-backport failed with a conflict on
muted-tests.yml