fix(session): Log why session renewal failed

[ChristophWurst]

Summary

This is a follow-up to #40785, which logs

{
  "reqId": "wEtQ6wYq1uWybvZebFcb",
  "level": 3,
  "time": "2023-10-11T06:18:27+00:00",
  "remoteAddr": "abc:def::",
  "user": "--",
  "app": "core",
  "method": "GET",
  "url": "/",
  "message": "Renewing session token failed",
  "userAgent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/117.0.0.0 Safari/537.36",
  "version": "27.1.2.1",
  "data": {
    "app": "core",
    "user": "user123"
  },
  "id": "65264067911b1"
}

but doesn't tell me the reason for the renewal error.

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[ChristophWurst]

/backport to stable27

[ChristophWurst]

/backport to stable26