[fix](nereids) Keep partition predicates for short-circuit point queries

[bzhang-obsec]

Partition pruning removes a partition predicate once the surviving partitions fully imply it, e.g. pk = 'abcd' against a LIST partition whose only value is 'abcd'. A short-circuit point query needs the equality conjuncts on every key column to remain in the scan: they are what PointQueryExecutor uses to pick the bucket and build the key tuple. Without them the executor fails with IllegalStateException.

Extend the existing skipPrunePredicate carve-outs (session variable, delete statements) with short-circuit queries, in both the rewrite rule and the post processor.

What problem does this PR solve?

Issue Number: close #66030.

Problem Summary:

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• Behavior changed:

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[hello-stephen]

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[bzhang-obsec]

run buildall

[hello-stephen]

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