Hide "Notes" folder in the sidebar

### What Happened?

Some Notes apps (like iOS Notes) store notes in a toplevel "Notes" folder for an associated email account. These are not emails, but we currently show their folder in the sidebar as if they are emails

### Steps to Reproduce

Have an app that adds notes to your email account like iOS Notes. See that these notes can be read in Mail:


### Expected Behavior

We should hide this folder in Mail.

But good to know that we could build an EDS-backed syncable notes app!

### OS Version

7.x (Horus)

### Software Version

Latest release (I have run all updates)

### Log Output

_No response_

### Hardware Info

_No response_