ENT-2892 | Bump edx-enterprise to 3.4.36.  This version removes some model field references, but does not create a migration, to the test to check that migrations are in sync has been skipped here.

* using new welcome template when redirected from enterprise proxy login view

* enabling safe redirects to enterprise learner portal from login in devstack

* ading admin portal to login redirect whitelist

* running make upgrade to version bump edx-enterprise

* Updating Python Requirements

* pin maxminddb

Co-authored-by: Zulqarnain <muhammad.zulqarnain@arbisoft.com>

* upgrading edx-enterprise to 3.3.25

* updating edx-enterprise in constraints file

Adding constraint for ora2.
latest version causing failures.

A migration is causing problems, reverting until it's resolved

Unskip a test that the new version fixes

isort 5.0.0 dropped support for Python 3.5.

ENT-3073

This will allow for more controlled releases of enterprise code in edx-platform.

This change will prevent Library Content from being marked as
complete on view and the corresponding version bump to
edx-completion contains code that will start looking at the
children of the library content for completeness.

...and pin django-ipware for the moment

Removing ddt constraint.

The new releases end up importing code in Studio that relies on an LMS-only setting. Pinning until resolved.

Also pinning edx-completion until the test failures in #24365 get resolved.

Upgrade to 1.0.0 caused issues which are described and being
investigated in https://github.com/django-ses/django-ses/issues/186.

Upgrade transifex-client version.

This is only made in order to run the tests with a transifex-client version compatible with python3.8

The actual problem that we have in edx-platform is that the last version of transifex-client has as constraint python-slugify<2.0.0 which is not compatible with the current requierements of edx-platform on the other hand, the current version used in edx-platform is not compatible with python3.8

sympy needs to be at a newer version for python3.

updated the constraints order

Remove pandas requirement.
Replace pandas functionality with itertools.group_by.

* Updating Python Requirements

* Pin django-pipeline and lxml

Co-authored-by: Jeremy Bowman <jbowman@edx.org>

Cleaned up a few more things about the testing configuration now that we've deployed Django 2.2 to production:

* Go back to a single version of django-oauth-toolkit, tox doesn't need to vary it anymore
* Go back to PyPI release of django-method-override
* Remove no longer needed dependency on python-oauth2 (we already removed the package it was used by)
* Update prepare_xdist_nodes.sh with new Django requirements file options