feat!: remove BasicAuthentication default

Removed BasicAuthentication as a default from DRF
endpoints that have not overridden the authentication
classes. It appears this is not in use, and was just
implicitly a default because it came from DRF's
defaults.

See DEPR: openedx#33028

(cherry picked from commit 7113624)

lms/envs/common.py

@@ -3344,12 +3344,10 @@ def _make_locale_paths(settings):  # pylint: disable=missing-function-docstring
 ######################### Django Rest Framework ########################
 
 REST_FRAMEWORK = {
-    # This matches the original DRF default of Session and Basic Authentication, but
-    # adds observability to help us potentially adjust the defaults. We would like to
-    # add JwtAuthentication and drop BasicAuthentication, based on our findings.
+    # These default classes add observability around endpoints using defaults, and should
+    # not be used anywhere else.
     'DEFAULT_AUTHENTICATION_CLASSES': [
         'openedx.core.djangolib.default_auth_classes.DefaultSessionAuthentication',
-        'openedx.core.djangolib.default_auth_classes.DefaultBasicAuthentication'
     ],
     'DEFAULT_PAGINATION_CLASS': 'edx_rest_framework_extensions.paginators.DefaultPagination',
     'DEFAULT_RENDERER_CLASSES': (

openedx/core/djangolib/default_auth_classes.py

@@ -4,7 +4,7 @@
 """
 from edx_django_utils.monitoring import set_custom_attribute
 from edx_rest_framework_extensions.auth.jwt.authentication import JwtAuthentication
-from rest_framework.authentication import BasicAuthentication, SessionAuthentication
+from rest_framework.authentication import SessionAuthentication
 
 
 class DefaultSessionAuthentication(SessionAuthentication):
@@ -33,38 +33,6 @@ def authenticate(self, request):
             raise
 
 
-class DefaultBasicAuthentication(BasicAuthentication):
-    """
-    Default BasicAuthentication with observability
-
-    Note that BasicAuthentication was a default because it was a DRF default.
-    Observability will be used to determine if BasicAuthentication could
-    instead be dropped as a default.
-    """
-
-    def authenticate(self, request):
-        # .. custom_attribute_name: using_default_auth_classes
-        # .. custom_attribute_description: This custom attribute will always be
-        #     True (if not NULL), and signifies that a default authentication
-        #     class was used. This can be used to find endpoints using the
-        #     default authentication classes.
-        set_custom_attribute('using_default_auth_classes', True)
-
-        try:
-            user_and_auth = super().authenticate(request)
-            if user_and_auth:
-                # .. custom_attribute_name: basic_auth_result
-                # .. custom_attribute_description: The result of basic auth, represented
-                #      by: 'success', 'failure', or 'skipped'.
-                set_custom_attribute('basic_auth_result', 'success')
-            else:
-                set_custom_attribute('basic_auth_result', 'skipped')
-            return user_and_auth
-        except Exception as exception:
-            set_custom_attribute('basic_auth_result', 'failure')
-            raise
-
-
 class DefaultJwtAuthentication(JwtAuthentication):
     """
     Default JwtAuthentication with observability