Fix N+1 problem for notes association

What does this MR do and why?

Follow-up for #347407 (closed)

In the previous MR I added a permission verification when user requests the list of participants. But it increased the number of db queries.

I found that notes association does not preload project object and that generates additional queries.

Screenshots or screen recordings

These are strongly recommended to assist reviewers and reduce the time to merge your change.

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.