ESQL: Fix connection closed in inline stats after pruned aggregates #136467
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- Replace `LocalSupplier.of` with new `CopyingLocalSupplier` in `PruneColumns` - Add `INLINE_STATS_AFTER_PRUNED_AGGREGATE` capability - Add test cases for inline stats after aggregate pruning
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The root cause was that when aggregate columns are pruned and no grouping columns exist, the optimizer creates a
LocalRelationwith aConstantNullBlockpage usingLocalSupplier.of()(which delegates toImmediateLocalSupplier), but during inline stats execution, this same page gets referenced and released twice - once when theLocalRelationserves as a source for the left-hand side of theInlineJoin, and again when it continues execution on the right-hand side, causing a double release error and connection closure. TheCopyingLocalSupplierprevents this by creating a deep copy of the page on eachget()call, ensuring proper memory management when the sameLocalRelationis used multiple times in inline stats scenarios.Closes #136349