chore: Remove Demographics frontend components from edx-platform (#35121)

[APER-2823]

Removes React compoents and functionality tied to a private 2U/edx.org-specific Demographics IDA from edx-platform.

This PR attempts to remove everything added from this PR: https://github.com/openedx/edx-platform/pull/24956/. This includes the React components created to collect and transmit Demographics data, as well as functionality for managing JWT and CSRF tokens copied from `frontend-platform` to edx-platform when originally implementing the CTA and modal components.

webpack.common.config.js

@@ -98,9 +98,6 @@ module.exports = Merge.smart({
             StudentAccountDeletion: './lms/static/js/student_account/components/StudentAccountDeletion.jsx',
             StudentAccountDeletionInitializer: './lms/static/js/student_account/StudentAccountDeletionInitializer.js',
             ProblemBrowser: './lms/djangoapps/instructor/static/instructor/ProblemBrowser/index.jsx',
-            DemographicsCollectionBanner: './lms/static/js/demographics_collection/DemographicsCollectionBanner.jsx',
-            DemographicsCollectionModal: './lms/static/js/demographics_collection/DemographicsCollectionModal.jsx',
-            AxiosJwtTokenService: './lms/static/js/jwt_auth/AxiosJwtTokenService.js',
             EnterpriseLearnerPortalModal: './lms/static/js/learner_dashboard/EnterpriseLearnerPortalModal.jsx',
 
             // Learner Dashboard