[Parent Issue] Improve observability for multi-stage query engine

[Jackie-Jiang]

• Improve error handling and reporting: Improve error handling and reporting in query side #14950
• Improve execution stats: [Multistage] Improve Observability for Diagnosing Performance of Multistage Engine Queries #15057
• Improve query logging

[hpvd]

just as a hint to further optimize usability of parent issues:
now there is an automatic for checking tasks in a task list if linked issue/pull is closed:
so we can

• have an overview aka "3 of 5 task"
• but have no double work...

see
https://docs.github.com/en/get-started/writing-on-github/working-with-advanced-formatting/about-task-lists

would look like this:

• Improve error handling and reporting Improve error handling and reporting in query side #14950
• Improve execution stats [Multistage] Improve Observability for Diagnosing Performance of Multistage Engine Queries #15057
• Improve query logging

with markup:

- [ ] Improve error handling and reporting #14950
- [ ] Improve execution stats #15057
- [ ] Improve query logging