We separate "Your account" section to two different sections -
"Profile" section for user name, custom profile fields, and avatar
and "Account & Security" section for email, password, role, api-key
and deactivating button.
Another important change here is that the modal for changing name
is removed and now the name has a simple input text box and it
behaves similar to inputs for custom-profile-fields.
Fixes#18848.