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Dolt oracle suites never exercise multi-level prolly trees #3162

Description

@timsehn

Summary

0 of 73 vc_oracle_*_test.sh build more than a few dozen rows, so merge/diff/cherry-pick against Dolt is only ever checked on 1-2 level trees. Coverage shows the gap: prolly_diff.c 64.9% lines, diffNodesOneLevel 17%, diffLeaves 31%, diffMergeWalk/diffEmitSubtree/diffCursorWalk 0%, replaceBatchLeafNoRechunk 15%, which are the internal-node arms of diff and batch replace. Related classes: #3068, #3005, #2916.

Proposal

A vc_oracle_scale_merge_test.sh with 20-50k-row tables (3+ levels), divergent edits spread across leaves, and a schema change on one side, comparing merge, cherry-pick, diff, diff_stat and diff_summary against Dolt. Estimated 2-4 min, in the merge bucket.

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