[Bug] ORCA: "bogus index qualification" when a filter on an INCLUDE-only index column is pushed into the index qual

### Apache Cloudberry version

main branch (recent build)

### What happened

With ORCA enabled, a query filtering on a column that is only an `INCLUDE` column of an index fails at execution time with an internal error:

```
ERROR: bogus index qualification (nodeIndexscan.c:1249)
```

ORCA generates an index scan on `bogus_i` and pushes `c1` into the index qualification (`EXPLAIN` shows `Index Cond: (c1 = true)`), but `c1` is a non-key `INCLUDE` column and `ExecIndexBuildScanKeys` rejects it. Line number is from current `main`. With `optimizer = off` the query returns the correct 2 rows.

Found by SQLancer.

### What you think should happen instead

The query should return the two rows where `c1` is true, with either optimizer.

### How to reproduce

```sql
CREATE TABLE bogus_t (c0 boolean, c1 boolean);
CREATE INDEX bogus_i ON bogus_t (c0) INCLUDE (c1);
INSERT INTO bogus_t VALUES (true, true), (false, true), (true, false);

SET optimizer = on;
SELECT * FROM bogus_t WHERE c1;
-- ERROR: bogus index qualification (nodeIndexscan.c:1249)

SET optimizer = off;
SELECT * FROM bogus_t WHERE c1;
-- 2 rows
```

### Operating System

Linux

### Anything else

Found while running SQLancer against Cloudberry `main` (3-segment demo cluster, `--enable-cassert`). See the proposal to run SQLancer continuously: https://github.com/apache/cloudberry/discussions/1952

### Are you willing to submit PR?

- [x] Yes, I am willing to submit a PR!

### Code of Conduct

- [x] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct)

Reproduce the failure with the SQL example, then read nodeIndexscan.c around line 1249 and compare the ORCA EXPLAIN output with optimizer disabled. The fix is complete when the INCLUDE-only-column filter no longer causes a bogus index qualification and the query returns the expected two rows with either optimizer setting.

Written by the indexing model from the issue text.