feat!: hide courses in /courses based on catalog visibility

Previously, courses were always displayed on the LMS /courses page,
independently of their catalog visibility attribute. This meant that
even with visibility="none" courses were being displayed. This was very
counter-intuitive.

With this change, courses are displayed only when their visibility is
set to "both".

This change is flagged as breaking because it has the potential to
affect course catalogs in existing platforms.

To test this change, go to http(s)://LMS/courses as an anonymous user.
Pick a visible course and go to its "advanced settings" in the studio.
Set "Course visibility in catalog" to "about" or "none". Then, clear the
cache with the following command:

    ./manage.py lms shell -c "from django.core.cache import cache; cache.clear()"

Open the /courses page again: the course should no longer be visible.

Close openedx/wg-build-test-release#330

lms/djangoapps/courseware/views/views.py

@@ -46,7 +46,11 @@
 from rest_framework.throttling import UserRateThrottle
 from token_utils.api import unpack_token_for
 from web_fragments.fragment import Fragment
-from xmodule.course_block import COURSE_VISIBILITY_PUBLIC, COURSE_VISIBILITY_PUBLIC_OUTLINE
+from xmodule.course_block import (
+    COURSE_VISIBILITY_PUBLIC,
+    COURSE_VISIBILITY_PUBLIC_OUTLINE,
+    CATALOG_VISIBILITY_CATALOG_AND_ABOUT,
+)
 from xmodule.modulestore.django import modulestore
 from xmodule.modulestore.exceptions import ItemNotFoundError, NoPathToItem
 from xmodule.tabs import CourseTabList
@@ -288,7 +292,10 @@ def courses(request):
     course_discovery_meanings = getattr(settings, 'COURSE_DISCOVERY_MEANINGS', {})
     set_default_filter = ENABLE_COURSE_DISCOVERY_DEFAULT_LANGUAGE_FILTER.is_enabled()
     if not settings.FEATURES.get('ENABLE_COURSE_DISCOVERY'):
-        courses_list = get_courses(request.user)
+        courses_list = get_courses(
+            request.user,
+            filter_={"catalog_visibility": CATALOG_VISIBILITY_CATALOG_AND_ABOUT},
+        )
 
         if configuration_helpers.get_value("ENABLE_COURSE_SORTING_BY_START_DATE",
                                            settings.FEATURES["ENABLE_COURSE_SORTING_BY_START_DATE"]):