feat: Add REST APIs for course advanced settings and course tabs

This commit adds new APIs that allow MFEs to modify a course's advanced settings
and to update tab settings to show/hide/move tabs.

openedx/core/lib/api/serializers.py

@@ -69,4 +69,4 @@ class UsageKeyField(serializers.Field):
         try:
             return UsageKey.from_string(data)
         except InvalidKeyError as err:
-            raise serializers.ValidationError("Invalid course key") from err
+            raise serializers.ValidationError("Invalid usage key") from err

openedx/core/lib/api/view_utils.py

@@ -91,7 +91,7 @@ class DeveloperErrorViewMixin:
             return exc.response
         elif isinstance(exc, APIException):
             return self._make_error_response(exc.status_code, exc.detail)
-        elif isinstance(exc, Http404) or isinstance(exc, ObjectDoesNotExist):  # lint-amnesty, pylint: disable=consider-merging-isinstance
+        elif isinstance(exc, (Http404, ObjectDoesNotExist)):
             return self._make_error_response(404, str(exc) or "Not found.")
         elif isinstance(exc, ValidationError):
             return self._make_validation_error_response(exc)