ECOM-4218 Draft 2 to add course card styles (#12593)

...s/learner_dashboard/collections/course_card_collection.js

lms/static/js/learner_dashboard/models/course_card_model.js

lms/static/js/learner_dashboard/views/course_card_view.js

lms/static/js/learner_dashboard/views/course_enroll_view.js

...static/js/learner_dashboard/views/program_details_view.js

...static/js/spec/learner_dashboard/course_card_view_spec.js

...atic/js/spec/learner_dashboard/course_enroll_view_spec.js

lms/static/lms/js/spec/main.js

lms/static/sass/elements/_course-card.scss

lms/templates/learner_dashboard/course_card.underscore

lms/templates/learner_dashboard/course_enroll.underscore

...emplates/learner_dashboard/program_header_view.underscore