Anonymous users may now view units in the courseware. This access is limited to units that are not considered problems/graded (e.g. homework, exams).

Moves ENABLE_ENTERPRISE_INTEGRATION to settings.FEATURES,
and changes the default value to False.

https://github.com/edx/edx-enterprise/compare/0.51.0...0.51.2

Follow up PR for PR-15863 to remove the field from database table.

LEARNER-2201

In settings_handler and any_unfulfilled_milestones (for mobile APIs)

WL-1109. Currently the system is using org filters to tag zendesk
tickets. MITxPro uses both MITxPro and MITProfessionalX org filters
to pull courses from both orgs. This is causing multiple emails to
be sent from Zendesk as they are getting tagged with both
whitelabel_MITProfessionalX and whitelabel_MITxPRO. This fix changes
to using SITE_NAME instead.

EDUCATOR-341

This makes it possible to refer to multiple book from a single app.

This also means that Open edX branches will be able to pass bok-choy
tests (at least if the books have already been built.)

LEARNER-394

(cherry picked from commit 1c7f35d44a68010f3dd9110061e9ecc55a641043)

(cherry picked from commit acee7b55aff0c73c08552199c536d84555bcaae4)

Ensure Enterprise-integrated courses require user consent before granting access to Wiki and Discussion forum.

* User-facing links are gated; internal services are not.
* Adds view decorator data_sharing_consent_required
* Renames `get_course_specific_consent_url` to `get_enterprise_consent_url`,
  which now checks `consent_needed_for_course` before returning a consent URL.

Introduces a mgmt. command that retrieves course runs from catalog service in order to update marketing urls for the courses found in course metadata cache (i.e. CourseOverview). This also provides an updated utility to retrieve course sharing url.