Draft: Resolve "Blocking a user adds a note to the account"

What does this MR do and why?

This will create a user note when an admin blocks that user's account.

Screenshots or screen recordings

How to set up and validate locally

From a fresh GDK install, you may need to create a user (if you've run the QA tests, a number of users will have been created for you.)

1. Log into GDK as root (or another administrator account)
2. Navigate to the test user's admin page (e.g. http://gdk.test:3000/admin/users/user_8884d41d )
3. Note the lack of admin notes
4. Under '... user administration' choose 'block' and then confirm the dialog
5. You should see it successfully blocked, and a new admin note with the date and 'Blocked by root'

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.

Related to #352797 (closed)