INCR-40 use ipaddress instead of ipaddr

Add new Option to Show Answer Dropdown.

Fixes flaky tests in schedules.tests.TestCourseUpdateResolver

In Studio: Introduces a new option, `after some number of attempts`
and a new entry box for specifying the number of attempts.
This allows course creators to specify that a given question's
answer is only viewable, i.e its show answer button is visible,
after the learner has attempted answering the question -
by hitting the submit button - a given number of times. Included
in this commit are unit tests for the new feature.

Implement public cohort for anonymous and unenrolled users

LMS copy changes to support using proctortrack's onboarding exams

Change "practice exam" to "onboarding" for courses that support onboarding exams.

using CacheIsolationTestCase

Bump edx-enterpise to 1.2.11

ARCH-379: add user_id scope and claim for JWT cookies

Run make upgrade

- Dependent on https://github.com/edx/edx-enterprise/pull/429

TE-2851 Preserve stdout on Jenkins test failures

Update version of edx-proctoring and update copy to refer to onboarding exams in Studio for proctoring backends that support onboarding exams.

Don't break exports for uninstalled XBlock content

This PR is based on #19284 and is part of the
series of work related to the proposal #18134.

This PR avoids the assignment of
anonymous/unenrolled users to any cohort when
course is public. Anonymous or unenrolled users
will only see content that does not have a
content group assigned.
The "View Course" link to the course outline
is shown on the course about page for a course
marked public/public outline.
It also makes course handouts available for
public courses (not for public_outline).
This PR also hides the different warnings and
messages asking the user to sign-in and enroll
in the course, when the course is marked public.
It modifies the default public_view text to
include the component display_name when
unenrolled access is not available.

The following changes are made to add LMS user_id:
* Adds user_id scope to the JWT to provide the LMS user_id.
* JWT cookies always use the user_id claim.

ARCH-379

wait for ajax on problem reset in test

ENT-1481: Update final copy recovery feature copy

ENT-1492: Update dashboard alert link and account settings page styling

Add support for beta languages

Add api support to let users opt out of email updates.

Scheduled emails show "unsubscribe" link if waffle switch `schedules.course_update_show_unsubscribe` is enabled, and
settings.ACE_ENABLED_POLICIES respects `bulk_email_optout`.

API endpoint allows GET/POST requests, which:

* GET asks for confirmation of opt-out
* POST accepts "unsubscribe" or "cancel", where "unsubscribe" creates the
  Optout entry, and "cancel" does nothing.

Bump xblock-drag-and-drop-v2 to v2.2.1 which includes i18n support in JS files

Roll out gradebook waffle flag to be default on

When an unknown content type is encountered, it's imported as a
RawDescriptor, which will preserve the OLX and export it back out. But
if we import a course while an XBlock is installed and then export it
after that XBlock is removed, we export RawDescriptors that never got to
save the original OLX and have a blank "data" field. Attempting to
export this used to fail and break export altogether. We now test that
the export continues to complete, and just skips over anything it can't
serialize out.

Note that this will stil export pointers in the export, so if you
uninstalled a "AmazingBlock" and exported, you might see something like
the following in a vertical's XML::

<vertical display_name="Unit">
  <amazing url_name="2edebb68d5734395a06b8a62b9bb677e"/>
</vertical>

However there would be no corresponding file at:
  /amazing/2edebb68d5734395a06b8a62b9bb677e.xml

In fact, there would be no /amazing directory at all in the export.

The better long term solution is probably to leave the pointer as-is
and export some generic file that can't be mistaken for OLX (say a
JSON file) that represents the raw key-value data we have in
Modulstore for the now unknown XBlock type. However, this commit at
least keeps export from crashing out entirely.

rather than using practice exams

JIRA:EDUCATOR-3960

tiny style modification

fix unicode strings in pavelib/

Add pull and shell make targets