Upgrade edx-enterprise to 3.0.7

Cut off long course welcome messages

Revert "Adds retry logic for software secure."

Add a draft decision related to bokchoy experiment.

Revert "Remove todo"

If a course welcome message is very long, cut it off with an
ellipsis and show a Show More button to reveal the full thing.

AA-46

ProblemGradeReport OOM - Case1&2

(LMS side was already fixed.)

ENT-2612 Fix issue with enterprise selection page redirect

BOM-1495: Django 2.0: fails on comparing nested lists.

Remove todo

ENT-2675 | Added permission for staff user to change the student's en…

Adds retry logic for software secure.

Prepare to upgrade to django-oauth-toolkit (module name oauth2_provider) 1.3.2 concurrently with the Django 2.2 upgrade (versions after 1.1.3 dropped support for Django 1.11). Key points:

* We can stop using a commit hash since versions 1.3.0 through 1.3.2 have been released since that commit.
* The validator in oauth_dispatch migration 0002 has been removed from DOT, but the whole table was removed in migration 0004 anyway. Newer DOT versions moved where redirect URI validation happens so it's no longer needed here.
* DOT 1.3.0 squashed its original 6 migrations and immediately deleted them. This required some changes in oauth_dispatch migrations 0006 and 0007 to deal with either numbering system.

When deploying to stage and production, we'll need to delete the history for oauth2_provider migrations 0002-0006 first (the new squashed 0001 migration has the same name as the original 0001). The deployment with DOT 1.3.2 will add a new 0002 migration which should then apply cleanly on the existing database state.

Should resolve https://openedx.atlassian.net/browse/BOM-1456 .

This looks like the last failing unit test under Django 2.2. One of a series of such failures resulting from Django no longer accepting None as POST data (since you can't really get it from a real request), most of which were already fixed by the Arbisoft team in the last few days.

Django2 shopping_cart: temporary test fix

Got the template that is used with tests but not this one.

Add writes to new field & data migration for backfiling data

Added temporary logs

This dashboard template is only used for edx.org so we didn't catch this
in testing.  Updating it to use 'course' instead of 'course_id' to
instantiate a CourseEnrollment object.  Using 'course_id' is the old
way.

Limit the last_name field to 30 chars.

fix: Improving access check in CoursewareInformation view

Remove `course_id` field from CourseMode.

BOM-1493

Handle this change appropriately in CourseModeFactory.

We don't use this field in edx-platform since we rely on UserProfile
instead.  But we need to do this to prevent accidental incorrect use of
this field.  Django adds a migration between 1.11 and 2.2 to increase
the length of this field that we are opting to skip.  This change
enforces the old limit.

WIP Remove the course_id property on student.CourseEnrollment.

We now either pass in the relevant courseoverview or when creating the
enrollement we use the factory which automatically creates the relevant
CourseOverview object for testing purposes.

Pass in a CourseOverview object instead of expecting that passing id will work as expected.