refactor: remove lms/djangoapps/debug/management directory

It contained only one management command, "dump_xml_courses", which
didn't work since the late 2015.

lms/djangoapps/debug/management/commands/dump_xml_courses.py

@@ -1,56 +0,0 @@
-"""
-Export all xml courses in a diffable format.
-
-This command loads all of the xml courses in the configured DATA_DIR.
-For each of the courses, it loops through all of the modules, and dumps
-each as a separate output file containing the json representation
-of each of its fields (including those fields that are set as default values).
-"""
-import json
-
-from django.conf import settings
-from django.core.management.base import BaseCommand, CommandError
-from path import Path as path
-
-from xmodule.modulestore.xml import XMLModuleStore
-
-
-class Command(BaseCommand):
-    """
-    Django management command to export diffable representations of all xml courses
-    """
-    help = '''Dump the in-memory representation of all xml courses in a diff-able format'''
-    args = '<export path>'
-
-    def handle(self, *args, **options):
-        if len(args) != 1:
-            raise CommandError(f'Must called with arguments: {self.args}')
-
-        xml_module_store = XMLModuleStore(
-            data_dir=settings.DATA_DIR,
-            default_class='xmodule.hidden_module.HiddenDescriptor',
-            load_error_modules=True,
-            xblock_mixins=settings.XBLOCK_MIXINS,
-        )
-
-        export_dir = path(args[0])
-
-        for course_id, course_modules in xml_module_store.modules.items():
-            course_path = course_id.replace('/', '_')
-            for location, descriptor in course_modules.items():
-                location_path = str(location).replace('/', '_')
-                data = {}
-                for field_name, field in descriptor.fields.items():
-                    try:
-                        data[field_name] = field.read_json(descriptor)
-                    except Exception as exc:  # pylint: disable=broad-except
-                        data[field_name] = {
-                            '$type': str(type(exc)),
-                            '$value': descriptor._field_data.get(descriptor, field_name)  # pylint: disable=protected-access
-                        }
-
-                outdir = export_dir / course_path
-                outdir.makedirs_p()
-                with open(outdir / location_path + '.json', 'w') as outfile:
-                    json.dump(data, outfile, sort_keys=True, indent=4)
-                    print('', file=outfile)