Improve rerun test

for troubleshooting TNL-692
Update wording per Doc
When s3fs cannot be accessed replaced with osfs
reorg of the receipt page header to match rest of the flow; removed cart-list class from receipt page wrapper
Updates to Demographics Display

- Gating on feature enabled for Open edX users
- If feature disabled and Insights URL is set, displaying message pointing users to Insights
Remove proxying of resources_fs, and add a unittest that exposes the problem

[PLAT-191]
Fixes for MOB-836 and MOB-766 and MA-96.
Studio: cleaning up/removing unused sass

* removing unused font-family-centric Sass variables
* removing unused graphic images and Sass references
* clean up of style removal fallout
deleting more things
courseware header bar should not overflow shopping cart button TNL-722
generalize draft import/export TNL-574

add test for videomodule

Import drafts handles modules w/o xml_attributes
and ones using the old parent_sequential_url pointer

Handle drafts for modules which don't define nor extract xml_attributes

Support  and  in get_items qualifiers

Unit test for   value query
Add the ability for course staff to specify a Survey and make it required so that a student must fill it out before starting the course
Remove extra large-FOO-icon.png files
Removed more files from cms
Deleted some unused images under common
content-types is no longer around
Merge pull request #5538 from edx/adam/generalized-draft-import-export-2

Adam/generalized draft import export 2
Wrap ModuleSystem and DescriptorSystem into a single object, to continue holding up the XModule house of cards

[PLAT-191]
Add email template for verified certificate date
Merge pull request #5765 from edx/carol/docs/DOC-1100

Add email template for verified certificate date