feat: replace DSC decorator and enterprise imports in courseware

[pwnage101]

• Create lms/djangoapps/courseware/decorators.py with courseware_view_redirect decorator that calls CoursewareViewRedirectURL filter and redirects to the first URL in the result list, if non-empty.
• Replace data_sharing_consent_required with courseware_view_redirect in CoursewareIndex, CourseTabView, progress, and course_wiki_redirect.
• Replace get_enterprise_consent_url with CoursewareViewRedirectURL filter call in WikiAccessMiddleware.
• Remove enterprise.models module-level import from access_utils.py; replace enterprise_learner_enrolled with _get_courseware_redirect_url (filter-based helper); update check_data_sharing_consent to use filter; move enterprise model imports to local scope in check_correct_active_enterprise_customer.
• Add OPEN_EDX_FILTERS_CONFIG with CoursewareViewRedirectURL entry in lms/envs/common.py.
• Update tests to mock CoursewareViewRedirectURL.run_filter instead of enterprise functions.

ENT-11544

---

Blocked by:

• feat: add CoursewareViewRedirectURL filter openedx-filters#336
• feat: add CoursewareViewRedirectURL pipeline steps edx-enterprise#2548