Update versions to remove datadog.

ENT-1467 Version bump for edx-enterprise to 1.2.8

make upgrade to version of edx-proctoring

without blocking multiple concurrent sessions

also updates trace amounts of copy duplicated in tests between
edx-proctoring and edx-platform

JIRA:EDUCATOR-3931

EDUCATOR-3914 fix enroll now text contrast ratio on LMS

ENT-1452: Consolidate recovery assistance forms

fix video player various buttons accessibility

Merge release back to master

Configuration changes to translation of third party lib

Running make upgrade to bump edx-entprise from 1.2.3 to 1.2.5. Also, updating constraints.txt to prevent a backwards incompatible update from oauthlib

ensure content start date banner only shows for currently open sections

change banner date localization to use dateutilfactory

mathjax a11y update

Add OAuth2 and JWT support to XBlock handlers

This adds OAuth2 and JWT API to call XBlock handlers. It is an alternative approach to #15940 - it reuses some DRF logic to handle this, but does not convert `handle_xblock_callback` to DRF view, which caused issues described in edx/XBlock#383.

Use print() function in both Python 2 and Python 3

Fix styling for proctoring banner inside + outside bootstrap

Fix quality violations.

Enable proctortrack exam configuration in Studio

JIRA:EDUCATOR-3913

add a proctoring settings button to course outline in Studio for each proctored subsection for a course using a provider that supports a dashboard

also a11y update: up contrast on proctored exam interstitials to be
WCAG2AAA compliant

JIRA:EDUCATOR-3871

Added logs

Change Account Settings form controls border color

WL-1660: Added ability to stop redirect to course home page

Change name in authors.

Create GET route for Subsection Grades, Overrides, and the Override H…