AA-99: Adding in new date pills for the dates tab

lms/djangoapps/course_api/blocks/api.py

lms/djangoapps/course_api/blocks/transformers/__init__.py

lms/djangoapps/course_blocks/api.py

lms/djangoapps/course_blocks/transformers/start_date.py

lms/djangoapps/course_blocks/usage_info.py

lms/djangoapps/courseware/courses.py

lms/djangoapps/courseware/date_summary.py

lms/djangoapps/courseware/tests/test_date_summary.py

lms/djangoapps/courseware/tests/test_views.py

lms/djangoapps/courseware/views/views.py

lms/static/sass/course/_dates.scss

lms/templates/courseware/dates.html

openedx/features/calendar_sync/tests/test_ics.py

openedx/features/content_type_gating/block_transformers.py

openedx/features/course_experience/utils.py

.../features/course_experience/views/course_home_messages.py

scripts/thresholds.sh