refactor: Remove capa folders (#38045)

This commit removes the following folders:

* `xmodule/capa/`
* `common/static/applets/capa/`
* `common/static/images/capa/`
* `common/static/js/capa/`

These directories have been moved to `xblocks-contrib/problem` as-is and will
now be maintained and used from there. All relevant imports in openedx-platform
have been updated to reference the new paths in `xblocks-contrib/problem`. This
removes duplication and consolidates CAPA-related code and static assets within
the same repository as the Problem XBlock.

Part of: #36538

Author: irtazaakram

cms/djangoapps/contentstore/rest_api/v2/views/utils.py

@@ -5,7 +5,7 @@
 from rest_framework.generics import GenericAPIView
 from rest_framework import permissions
 from cms.djangoapps.contentstore.rest_api.v2.serializers.utils import NumericalInputValidationRequestSerializer
-from xmodule.capa.inputtypes import preview_numeric_input
+from xblocks_contrib.problem.capa.inputtypes import preview_numeric_input
 
 
 class NumericalInputValidationView(GenericAPIView):

cms/envs/common.py

@@ -289,7 +289,6 @@
 
 MAKO_TEMPLATE_DIRS_BASE.insert(3, COMMON_ROOT / 'static')
 MAKO_TEMPLATE_DIRS_BASE.append(CMS_ROOT / 'djangoapps' / 'pipeline_js' / 'templates')
-MAKO_TEMPLATE_DIRS_BASE.append(XMODULE_ROOT / 'capa' / 'templates')
 
 
 def make_lms_template_path(settings):

common/djangoapps/edxmako/services.py

@@ -54,7 +54,6 @@ def render_lms_template(self, template_file, dictionary):
 
         Templates which are in these dirs will only work with this function:
             edx-platform/lms/templates/
-            edx-platform/xmodule/capa/templates/
             openedx/features/course_experience/templates
         """
         return render_to_string(template_file, dictionary, namespace=lms_mako_namespace)