[doc] COLLECT_LIST / COLLECT_SET examples in 3.x/2.1: undefined tables + outdated array display format

### Pages

`COLLECT_LIST` and `COLLECT_SET` function references — `version-3.x` and `version-2.1`, EN + ZH:
- `versioned_docs/version-3.x/sql-manual/sql-functions/aggregate-functions/collect-list.md`
- `versioned_docs/version-3.x/.../collect-set.md` (+ version-2.1 and the `i18n/zh-CN` copies)

### Problems

**1. Undefined tables.** The examples query `collect_list_test` / `collect_set_test`, but neither page ever creates them, so copy-pasting fails with `table does not exist`.

**2. Outdated ARRAY display format.** Even after defining the tables, the printed outputs use a legacy array rendering that current Doris (verified on 3.1.4 and 2.1.11) no longer produces:

- **String/date elements are shown unquoted**, e.g. the docs print `[hello]`, `[world]`, `[2023-01-01,2023-01-02]`, but Doris renders string/date arrays **quoted**: `["hello"]`, `["world"]`, `["2023-01-01", "2023-01-02"]`.
- **No space after the comma**, e.g. docs `[1,2,2,3,3,4,4]` vs Doris `[1, 2, 2, 3, 3, 4, 4]`.

(Note this is internally inconsistent already — e.g. the sibling `ARRAY_AGG` page prints quoted string arrays.)

**3. `COLLECT_SET` extras.** The set-ordering example prints `[4,3,2,1]`, but `COLLECT_SET` returns an unordered set — element order is not deterministic, so the literal output isn't reproducible. The same example's output table also has a malformed bottom border (`+----...----+` merged across both columns).

### Suggested fix

Add `CREATE TABLE` + `INSERT` setup for both pages **and** refresh the expected outputs to the current array rendering (quoted string elements, space after comma). For the `COLLECT_SET` ordering example, either sort for determinism (e.g. `array_sort(collect_set(...))`) or relax the expected output, and fix the table border.

Left out of the phantom-table-setup PR series because it needs the documented outputs rewritten to match current rendering (an editorial change on these older release lines), not just a missing-table addition.