cypher_vle: add ORDER BY to non-deterministic RETURN queries

Several VLE regression queries RETURN multiple rows without an ORDER BY,
so their row order depends on traversal/scan order and can vary between
runs and platforms. Add ORDER BY ASC to those queries (on the path,
edge-list, or graphid as appropriate) so the expected output is stable.
The queries are pinned by path (p), edge list (e), or graphid
(id(u)/id(v)/id(e[n])) depending on what each RETURN projects.

Full audit of cypher_vle: all 38 multi-row result blocks were checked.
After this change, every multi-row RETURN is deterministically ordered
except the two SELECT * FROM show_list_use_vle('list01') calls, which are
already deterministic because the function body orders its results with
RETURN v ORDER BY id(v) (added in #2417); their result blocks are
unchanged by this commit.

This is a test-only change (regress/sql/cypher_vle.sql and
regress/expected/cypher_vle.out); no extension C code or SQL is modified.
Row counts are unchanged (pure reordering).

All 37 regression tests pass (installcheck) on PostgreSQL 18.3.

Co-authored-by: GitHub Copilot <noreply@github.com>

modified:   regress/expected/cypher_vle.out
modified:   regress/sql/cypher_vle.sql

Author: jrgemignani