Merge pull request #16625 from edx/waheed/LEARNER-3206-dates-mobile-fragment-changes

lms/envs/common.py

lms/static/sass/_build-mobile.scss

lms/static/sass/lms-mobile-rtl.scss

lms/static/sass/lms-mobile.scss

lms/static/sass/mobile/_main.scss

...ce/templates/course_experience/course-dates-fragment.html

...experience/templates/course_experience/dates-summary.html

...lates/course_experience/mobile/course-dates-fragment.html

...atures/course_experience/tests/views/test_course_dates.py

openedx/features/course_experience/views/course_dates.py