This fixes wrapping the exam-text bar on smaller screens during timed exams, which prevented users from viewing the exam's content.

This also has an initial use case for Personalized Learner Schedules
to add CTAs to capa and vertical blocks to allow users to shift their
course deadlines.

in a feature backport from the new Courseware/Learning MFE.

- use new dates banner template on course outline page
- remove old banner from main.html
- let dates tab use new dates banner template
- remove dates banner completely from the courseware problem view
  on the web app
- use new banner on the courseware problem view on the mobile app
- update banner util to use get_course_blocks

* Swap deprecated box-sizing mixin with the box-sizing property

* Linting now that box-sizing is no longer a mixin

* Fix all stylelint errors

For any errors that fixing would require changing the output of the css disable stylelint for that line instead of modifying.

* Update quality.py

Make stylelint quality check pass when there are no errors

* Delete empty selectors

- remove code for displaying banner in mobile dates fragment
- replace button with link to web app in reset dates banner on
  the mobile problem template
- adjust spacing of reset dates button in banner when button wraps
  on smaller screen

- render reset dates banner in webview for mobile app.
- improve banner redirect mechanism

- Also, only show banner if the course end_date has not already
  pass AND if the user is verified within the course.

- for self paced courses, if a sequential's due date has passed
  and it is incomplete, allow the user to reset the start_date
  for the related schedule to now, thus shifting all due dates
  for all sequentials within the course by the pre determined
  due date offset.
- add historical table to the Schedule model.

proctoring banner was interfering
with course goal banner. Z-index
added on proctoring banner to make
sure its always on top

learner-5581

The banner took up too much room with the browser
zoomed in. This adds a button to hide/show much of the copy, reducing the
portion of the page on zoomed-in desktop browsers stickily obscuring
courseware. The toggle's initial state is set according to browser
width.

update semantic structure of some proctoring banner elements

JIRA:EDUCATOR-3899

JIRA:EDUCATOR-3900

also a11y update: up contrast on proctored exam interstitials to be
WCAG2AAA compliant

JIRA:EDUCATOR-3871

In the dashboard header and the course navigation bar, the current
tab is supposed to be the only one with a bottom border.  But in
high contrast mode in Windows, all of them were assigned a bottom
border color.

So instead of toggling the color when active, toggle the border
style, since Windows overrides our color choice anyway.

LEARNER-3219

This reverts commit e32615e1.

LEARNER-2754

LEARNER-2977

Fixes

Updates the new bootstrap course home page to match the old course home page.

LEARNER-1694

Fix a11y failure

Fix header styling

Fix layout issues

Further layout fixes

The course header sass source is generating styles that eventually
are in conflict with some of the tabs.To avoid it, new style
properties are added that resolves it.

LEARNER-748

This reverts commit 0c204e35, reversing
changes made to 0495d70b.

JavaScript needs to be moved to edx-proctoring repo

* Reorders form fields, and updates labels, placeholders, and tip text
* Increases clickable area for links and labels.
* Removes "*" markers from required fields, and instead adds
  "(optional)" labels to visible optional fields.
* Updates font colors and sizes, and removes box shadows
* Adds custom drop-down styles
* Improves responsive design scaling for small screens
* Make Terms of Service and Honor Code open in new window to avoid losing form
  field values.

LEARNER-75

TNL-6347

nit: css