fix: remove a couple unused learning MFE serializer fields

Now that the frontend assumes there are no legacy courseware pages,
we can stop sending them info about it.

lms/djangoapps/course_home_api/course_metadata/serializers.py

@@ -33,7 +33,6 @@ class CourseHomeMetadataSerializer(VerifiedModeSerializer):
     """
     Serializer for the Course Home Course Metadata
     """
-    can_load_courseware = serializers.BooleanField()
     celebrations = serializers.DictField()
     course_access = serializers.DictField()
     course_id = serializers.CharField()

lms/djangoapps/course_home_api/course_metadata/views.py

@@ -126,7 +126,6 @@ class CourseHomeMetadataView(RetrieveAPIView):
             'is_self_paced': getattr(course, 'self_paced', False),
             'is_enrolled': user_is_enrolled,
             'course_access': load_access.to_json(),
-            'can_load_courseware': True,  # can be removed once the MFE no longer references this field
             'celebrations': celebrations,
             'user_timezone': user_timezone,
             'can_view_certificate': certificates_viewable_for_course(course),

lms/djangoapps/course_home_api/outline/serializers.py

@@ -51,7 +51,6 @@ class CourseBlockSerializer(serializers.Serializer):
                 'icon': icon,
                 'id': block_key,
                 'lms_web_url': block['lms_web_url'] if enable_links else None,
-                'legacy_web_url': block['legacy_web_url'] if enable_links else None,
                 'resume_block': block.get('resume_block', False),
                 'type': block_type,
                 'has_scheduled_content': block.get('has_scheduled_content'),