feat!: drop legacy course home view and related code

This was the "outline tab" view of the course. Preceded by the
course info view, succeeded by the MFE outline tab.

In addition to the course home view itself, this drops related
features:
- Legacy version of Course Goals (MFE has a newer implementation)
- Course home in-course search (MFE has no search)

The old course info view and course about views survive for now.

This also drops a few now-unused feature toggles:
- course_experience.latest_update
- course_experience.show_upgrade_msg_on_course_home
- course_experience.upgrade_deadline_message
- course_home.course_home_use_legacy_frontend

With this change, just the progress and courseware tabs are still
supported in legacy form, if you opt-in with waffle flags. The
outline and dates tabs are offered only by the MFE.

AA-798

(This is identical to previous commit be5c1a6, just reintroduced
now that the e2e tests have been fixed)

openedx/core/djangoapps/embargo/tests/test_middleware.py

@@ -9,14 +9,12 @@ from config_models.models import cache as config_cache
 from django.conf import settings
 from django.core.cache import cache as django_cache
 from django.urls import reverse
-from edx_toggles.toggles.testutils import override_waffle_flag
 from xmodule.modulestore.tests.django_utils import ModuleStoreTestCase
 from xmodule.modulestore.tests.factories import CourseFactory
 
 from openedx.core.djangolib.testing.utils import skip_unless_lms
 from common.djangoapps.student.tests.factories import UserFactory
 from common.djangoapps.util.testing import UrlResetMixin
-from lms.djangoapps.course_home_api.toggles import COURSE_HOME_USE_LEGACY_FRONTEND
 
 from ..models import IPFilter, RestrictedCourse
 from ..test_utils import restrict_course
@@ -24,7 +22,6 @@ from ..test_utils import restrict_course
 
 @ddt.ddt
 @skip_unless_lms
-@override_waffle_flag(COURSE_HOME_USE_LEGACY_FRONTEND, active=True)
 class EmbargoMiddlewareAccessTests(UrlResetMixin, ModuleStoreTestCase):
     """Tests of embargo middleware country access rules.
 
@@ -45,10 +42,7 @@ class EmbargoMiddlewareAccessTests(UrlResetMixin, ModuleStoreTestCase):
         self.course = CourseFactory.create()
         self.client.login(username=self.USERNAME, password=self.PASSWORD)
 
-        self.courseware_url = reverse(
-            'openedx.course_experience.course_home',
-            kwargs={'course_id': str(self.course.id)}
-        )
+        self.courseware_url = reverse('about_course', kwargs={'course_id': str(self.course.id)})
         self.non_courseware_url = reverse('dashboard')
 
         # Clear the cache to avoid interference between tests