Trac ticket number

ticket-23557

Branch description

Compares the results of collapse_group_by() with and without the expressions from order_by clause. Raises a deprecation warning if the results differ for database backends that do not support order by columns that are not present in the group by clause for grouped tables (SQL:2023 F868).

Checklist

• This PR targets the main branch.
• The commit message is written in past tense, mentions the ticket number, and ends with a period.
• I have checked the "Has patch" ticket flag in the Trac system.
• I have added or updated relevant tests.
• I have added or updated relevant docs, including release notes if applicable.
• I have attached screenshots in both light and dark modes for any UI changes.