Provide option of having My courses as defaulthomepage

In Moodle 4.0, the course overview block is being moved from the Dashboard to My courses. This will leave only the calendar and timeline blocks on the Dashboard.

For sites which don't use the calendar or timeline blocks, such as sites offering self-paced courses, it would be good to provide the option of having My courses as defaulthomepage.

Edited to add further information:

Thus, the site admin setting 'Start page for users' (defaulthomepage) should have an additional option 'My courses'.

The default value should remain as 'Dashboard' (for new and upgraded sites). For upgraded sites, whatever value was set previously should remain unchanged.

If defaulthomepage is set as 'User preference', then users should be able to select their preference via the User menu > Preferences > Start page and have the choice of Dashboard, Site home and My courses.

(PS the name 'Home page' is being changed to 'Start page' in MDL-73093.)