LEARNER-1366 EcommerceService should be able to provide a link to the basket page that contains multiple products

LEARNER-394

* mattdrayer: Add bulk checkout link to course views
* asadiqbal08: MAYN-225 replace the "Verify Now" button by the "Go to Dashboard" button in case of themed sites.
* mattdrayer: Add bulk_sku check in courseware.views

* mattdrayer: Add bulk checkout link to course views
* asadiqbal08: MAYN-225 replace the "Verify Now" button by the "Go to Dashboard" button in case of themed sites.
* mattdrayer: Add bulk_sku check in courseware.views

. And change the verification link in the sidebar to redirect to new basket if the EcommerceService is enabled.

. And change the verification link in the sidebar to redirect to new basket if the EcommerceService is enabled.

When Drupal attempts to enroll a user in a closed course, a 406 will
be returned. This causes the marketing site to redirect to the track
selection page for that course, which will then redirect to the
dashboard with a nice message.

ECOM-2317

- Remove escaping in display_name_with_default
- Move escaped version to deprecated display_name_with_default_escaped
- Does not include any other changes to remove double-escaping

Thanks to agaylard who initiated this work:
https://github.com/edx/edx-platform/pull/10756

TNL-3425

Remove cert messaging from audit cert/grade info partial

move enrollment display method to helpers

Please note that this is a squshed commit and the work of:
Symbolist, macdiesel, nedbat, doctoryes, muzaffaryousaf and muhammad-ammar

Add context for navigation states
added find course to dashboard sidebar and included check for context that Will adds in PR
removed nav_course_search context due to design change so replaced with nav_hidden
Removed rwd_header.js and all references as no longer being used.

Wrapped Find Courses in dashboard sidebar in if statement

* Delete reverification templates
* Delete photocapture.js
* Delete unused "name change" end-points
* Rebuild the reverification views using Backbone sub-views
* Stop passing template names to the JavaScript code
* Avoid hard-coding the parent view ID in the webcam view (for getting the capture click sound URL)

* Adds a credit course mode to indicate that a course
has a credit option.

* Hides the credit option from the track selection and
pay-and-verify pages.

* Shows different messaging for the verified track if
it's possible to upgrade from verified to credit at the end
of the course.

Block users from enrolling in a course if the user
is blocked by country access rules.

1) Enrollment via the login/registration page.
2) Enrollment from the marketing iframe (via student.views.change_enrollment)
3) Enrollment using 100% redeem codes.
4) Enrollment via upgrade.

This does NOT cover enrollment through third party authentication,
which is sufficiently complex to deserve its own commit.

Removes old payment and verification endpoints, views, templates, and tests, making the new split flow the default. The SEPARATE_VERIFICATION_FROM_PAYMENT feature flag is also removed.

Adds mode creation endpoint to course_modes app and ability to bypass media device access prompt when proceeding through verification flow in a testing environment.

Allow disabling of experiment