fixup! Add tests and changelog for auditlog sortkey columns

Update changelog to reflect v2 API instead of breaking change

Author: Simrayz

changelog.d/3757.changed.md

@@ -1,5 +1,3 @@
 Auditlog entries now store sortable display names for actor, object, and target, enabling sorting and searching on these columns. Links to detail pages are shown when the referenced object still exists.
 
-**BREAKING CHANGE:** The `/api/1/auditlog/` API endpoint now returns `actor`, `object`, and `target` fields as objects with `name` and `url` properties (e.g., `{"name": "admin", "url": "/useradmin/account/1/"}`) instead of plain strings. External consumers of this API will need to be updated to handle the new format.
-
 **Note:** The database migration includes backfill operations to populate sortkey columns for existing log entries. On deployments with millions of log entries, this migration may take some time to complete.