SASS compilation variable conventions update, focusing on basic colors, baseline variable usage for padding and margins, ui-depth extends, along with other small fixes. The intent with this is to not have any user-facing impact, and instead move us closer toward having files that use our newer sass conventions.

WL-172 Show a Order History list on the Student Dashboard for any PaidCourseRegistration or RegCodeItem that the user might have purchased

ECOM-728 updated dashboard course banners so all types of course are now supported as per the new design. Included some other small tweaks to other text on the page in consultation with AndyWaldrop

Change the reverification failure message styling.

Changing templates so new styles do not appear in courseware.

Removing unused aria tag.

PR comments on cleaning up SASS

Fix signup LMS test.

Copy changes per review on PR

Updating based on PR comments

Style and HTML changes for notifications

This reverts commit 1955aade36675289bdbc01554b6f74242754a746.

Updating EX-60 logic

resolving display issue where older/smaller courses images wouldn't fill designated area on the student dashboard

LMS-1071

* adds in Sass placeholder to mirror older/inherited button styling used in LMS
* uses light theming Sass variables for button styling
* adds specific selector for certificate download button