[fix](ann-index) Fix ANN range search state leakage and incorrect slot index tracking.

[kaka11chen]

What problem does this PR solve?

Issue Number: close #xxx

Related PR: #xxx

Problem Summary:

Release note

Cherrypick #63666

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• Test

  • Regression test
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Pull request overview

Fixes correctness issues in BE ANN range search pushdown by eliminating execution-state leakage across VExprContext clones and correcting how common-expression index-evaluation status is tracked when scan-block column order differs from storage column ids.

Changes:

• Replace ANN “executed/fulfilled” state stored on shared VExpr roots with a per-evaluation result object propagated via evaluate_ann_range_search(...).
• Track ANN range-search results in the current segment’s IndexExecContext and update common-expression index status using source column index (scan-block) rather than storage ColumnId.
• Add BE unit tests and regression tests covering mixed indexed/non-indexed segments and remapped schema/index-status cases.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 1 comment.

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File	Description
regression-test/suites/ann_index_p0/ann_range_search_source_index_status_regression.groovy	Adds regression coverage to ensure common-expr index status uses source column index so embedding reads can be skipped correctly.
regression-test/suites/ann_index_p0/ann_range_search_pushdown_regression.groovy	Adds regression coverage for mixed indexed/non-indexed segments ensuring ANN execution state doesn’t leak and profile counter is correct.
be/test/storage/index/ann/ann_range_search_test.cpp	Extends unit tests to validate no cross-clone state leakage and correct slot-map/index-status updates.
be/src/storage/segment/segment_iterator.cpp	Counts ANN range-search executions per evaluation call and removes reliance on shared-root state.
be/src/exprs/virtual_slot_ref.h	Updates ANN range-search virtual API signature to return per-call evaluation result.
be/src/exprs/virtual_slot_ref.cpp	Propagates new ANN evaluation result through virtual slot ref.
be/src/exprs/vexpr.h	Introduces AnnRangeSearchEvaluationResult and updates virtual method signature; removes shared-root execution state fields.
be/src/exprs/vexpr.cpp	Removes legacy state accessors and adapts base method signature.
be/src/exprs/vexpr_context.h	Extends context API to return per-call “executed” via out-param and support result caching flag.
be/src/exprs/vexpr_context.cpp	Uses per-call evaluation result, stores bitmap in IndexExecContext, and fixes source-index-based slot-map lookup / index-status update.
be/src/exprs/vectorized_fn_call.h	Updates ANN range-search override signature to return per-call evaluation result.
be/src/exprs/vectorized_fn_call.cpp	Sets per-call executed/fulfilled result instead of mutating shared-root state.

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[kaka11chen]

run buildall

[kaka11chen]

run buildall

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skip buildall

[github-actions]

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PR approved by anyone and no changes requested.