Add an manual enrollment audit creation API

Creates an API for other apps to be able to create manual enrollment
audit items. Follows the standards set forth in
docs/decisions/0002-inter-app-apis.rst

Fixes Course Grade Report.

 Handle `ValueError` while getting group for user.

This PR implements a waffle flag for generating course grade report only for verified learners.

fix(i18n): update translations

BOM-1022

-web-fragments version bump

Bump the version for edx-completion

edx-proctoring now has real OEP-30 annotations, remove from safelist

- Upgrade edx-drf-extensions to 2.4.5
- Removed constraint to 2.4.0, because 2.4.2 introduces a workaround for
ARCH-1210 by putting the problematic code behind a django setting.
- Remove unused JWT_AUTH_REFRESH_COOKIE setting.

ARCH-418, ARCH-1269, ARCH-1044

fix broken toggle

Registration API: Remove success field when not succeeded

 This is needed so Masters learners will not be in the same team as verfied and audit learners. If the team is designated as organization protected, it will not be visible or accessible by verified or audit track learners
MST-34

LEARNER-7476

Merge pull request #22213 from edx/iahmad/ENT-2339-Updated-login-flow-for-customers-with-multiple-enterprises

ENT-2339 Updated login flow for multiple enterprise

Fix pep 8 violations.

ENT-1849: Added caller info to the exception message

Studio export/import can introduce extra spaces into text formatted as code

BOM-1027

guincorn just released its version on 9th-nov-2019 (20.0.0)
and it requires Python 3.x >= 3.4.
so adding constraint < 20.0.0

execute make upgrade

Added caller in to the exception message to debug ENT-1849
Replaced `get_enterprise_learner_data` method call with `enterprise_customer_for_request` to get enterprise customer data from cache or session instead of hitting API.

Revert logs added to investigate audit cert cutoff date

PROD-978

remove small job queue condition for bulk email task

BOM-1012

APIs for XBlock static asset files in Blockstore

Remove View Archived Course button from unfulfilled entitlements.

Fix invocation of (edx.)HtmlUtils.ensureHtml

upgrade edx-enterprise to 2.0.16

Improve navigation on Studio unit page