Course Completed page should not be added to the menu

[renatho]

Steps to Reproduce

1. In a new environment, activate the Twenty Twenty-Four theme.
2. Install and activate Sensei LMS.

What I Expected

"Course Completed" page should not be in the menu.

What Happened Instead

"Course Completed" page shouldn't be in the site menu.

PHP / WordPress / Sensei LMS version

PHP 8.1 / WordPress 6.4 / Sensei LMS 4.20.2

Browser / OS version

Chrome / MacOS

Screenshot / Video

Context / Source

Partially related to https://github.com/Automattic/sensei/issues/7386, but it's the opposite issue. Sensei Pro has a solution that we could try to use here: https://github.com/Automattic/sensei-pro/pull/2435/files#diff-772b66240b10179254b38ebdbd36f569cadfd87836b39bec0394e591d7437ea1R252