Fix nondeterministic age_global_graph regression test

[jrgemignani]

The age_global_graph test had two issues that could cause intermittent failures:

1. Nondeterministic warning output: The graph_stats() call on a graph with deliberately deleted vertices produces WARNING messages for dangling edges. These warnings are emitted by iterating edge label tables (knows, stalks), and the iteration order is not guaranteed. Since PostgreSQL WARNING messages cannot be caught or counted from SQL (only ERROR and above are catchable via PL/pgSQL exception handling), we suppress them with SET client_min_messages = error. The suppressed warnings are documented verbatim in comments. The graph_stats() result row still validates correct dangling-edge handling.

2. Nondeterministic row ordering: Multiple MATCH...RETURN queries returned multi-row results without ORDER BY, relying on scan order. Added ORDER BY id(u), id(v), id(e), id(n), or id(a) as appropriate to all MATCH...RETURN queries for future-proofing, even those currently returning a single row.

Files changed:
regress/sql/age_global_graph.sql
regress/expected/age_global_graph.out

Co-Authored-By: Claude Opus 4.6 noreply@anthropic.com

[Copilot]

Pull request overview

This PR stabilizes the age_global_graph regression test by eliminating nondeterministic output sources (unordered result sets and unordered WARNING emission during graph_stats() on intentionally corrupted graphs).

Changes:

• Added explicit ORDER BY id(...) clauses to MATCH ... RETURN queries to ensure deterministic row ordering.
• Suppressed nondeterministic dangling-edge WARNING output around graph_stats() via SET client_min_messages = error, documenting the suppressed warnings in comments, and restoring the setting afterward.
• Updated expected regression output to match the stabilized SQL behavior.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
regress/sql/age_global_graph.sql	Adds deterministic ORDER BY to Cypher queries and suppresses nondeterministic WARNING output around graph_stats() with a SET/RESET block.
regress/expected/age_global_graph.out	Updates expected results to reflect the new ordering and the absence of suppressed WARNING lines, including SET/RESET echo lines.

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