feat!: Legacy account, profile, order history removal (#36219)

* feat!: Legacy account, profile, order history removal

This removes the legacy account and profile applications, and the order
history page. This is primarily a reapplication of #31893, which was
rolled back due to prior blockers.

FIXES: APER-3884
FIXES: openedx/public-engineering#71


Co-authored-by: Muhammad Abdullah Waheed <42172960+abdullahwaheed@users.noreply.github.com>
Co-authored-by: Bilal Qamar <59555732+BilalQamar95@users.noreply.github.com>

lms/djangoapps/discussion/views.py

@@ -4,6 +4,7 @@ Views handling read (GET) requests for the Discussion tab and inline discussions
 
 import logging
 from functools import wraps
+from urllib.parse import urljoin
 
 from django.conf import settings
 from django.contrib.auth import get_user_model
@@ -629,7 +630,7 @@ def create_user_profile_context(request, course_key, user_id):
             'page': query_params['page'],
             'num_pages': query_params['num_pages'],
             'sort_preference': user.default_sort_key,
-            'learner_profile_page_url': reverse('learner_profile', kwargs={'username': django_user.username}),
+            'learner_profile_page_url': urljoin(settings.PROFILE_MICROFRONTEND_URL, f'/u/{django_user.username}'),
         })
         return context